Although Lord Kṛṣṇa is Madana-mohana,
He becomes Madana-dāha, or enchanted by the beauty of Rādhārāṇī.

SB 3.15.42, Purport: The beauty of the Lord was so enchanting that it could not be sufficiently described. The goddess of fortune is supposed to be the most beautiful sight within the spiritual and material creations of the Lord; she has a sense of being the most beautiful, yet her beauty was defeated when the Lord appeared. In other words, the beauty of the goddess of fortune is secondary in the presence of the Lord. In the words of Vaiṣṇava poets, it is said that the Lord's beauty is so enchanting that it defeats hundreds of thousands of Cupids. He is therefore called Madana-mohana. It is also described that the Lord sometimes becomes mad after the beauty of Rādhārāṇī. Poets describe that under those circumstances, although Lord Kṛṣṇa is Madana-mohana, He becomes Madana-dāha, or enchanted by the beauty of Rādhārāṇī. Actually the Lord's beauty is superexcellent, surpassing even the beauty of Lakṣmī in Vaikuṇṭha. The devotees of the Lord in the Vaikuṇṭha planets want to see the Lord as the most beautiful, but the devotees in Gokula or Kṛṣṇaloka want to see Rādhārāṇī as more beautiful than Kṛṣṇa.

One who is attracted by the beauty of Rādhā and Kṛṣṇa cannot be attracted by the false beauty of this material world.

SB 3.20.31, Purport: The difference between demons and demigods is that a beautiful woman very easily attracts the minds of demons, but she cannot attract the mind of a godly person. A godly person is full of knowledge, and a demoniac person is full of ignorance. Just as a child is attracted by a beautiful doll, similarly a demon, who is less intelligent and full of ignorance, is attracted by material beauty and an appetite for sex. The godly person knows that this nicely dressed and ornamented attraction of high breasts, high hips, beautiful nose and fair complexion is māyā. All the beauty a woman can display is only a combination of flesh and blood. Śrī Śaṅkarācārya has advised all persons not to be attracted by the interaction of flesh and blood; they should be attracted by the real beauty In spiritual life. The real beauty is Kṛṣṇa and Rādhā. One who is attracted by the beauty of Rādhā and Kṛṣṇa cannot be attracted by the false beauty of this material world. That is the difference between a demon and a godly person or devotee.

When one is attracted by the transcendental beauty of Rādhā and Kṛṣṇa, he is no longer attracted by material feminine beauty.

SB 3.31.38, Purport: Instead of being attracted by material beauty, if one is accustomed to be attracted by the beauty of Rādhārāṇī and Kṛṣṇa, then the statement of Bhagavad-gītā, paraṁ dṛṣṭvā nivartate [Bg. 9.59], holds true. When one is attracted by the transcendental beauty of Rādhā and Kṛṣṇa, he is no longer attracted by material feminine beauty. That is the special significance of Rādhā-Kṛṣṇa worship. That is testified to by Yāmunācārya. He says, "Since I have become attracted by the beauty of Rādhā and Kṛṣṇa, when there is attraction for a woman or a memory of sex life with a woman, I at once spit on it, and my face turns in disgust." When we are attracted by Madana-mohana and the beauty of Kṛṣṇa and His consorts, then the shackles of conditioned life, namely the beauty of a material woman, cannot attract us.

CC Adi 4.214, Translation and Purport: Among the gopīs, Śrīmatī Rādhikā is the foremost. She surpasses all in beauty, in good qualities, in good fortune and, above all, in love.

Among all the gopīs, Śrīmatī Rādhārāṇī is the most exalted. She is the most beautiful, the most qualified and, above all, the greatest lover of Kṛṣṇa.

CC Adi 4.248, Translation: “Thus although I am the source of happiness for the entire world, the beauty and attributes of Śrī Rādhikā are My life and soul.

CC Adi 4.259, Translation: “‘My dear auspicious Rādhārāṇī, Your body is the source of all beauty. Your red lips are softer than the sense of immortal sweetness, Your face bears the aroma of a lotus flower, Your sweet words defeat the vibrations of the cuckoo, and Your limbs are cooler than the pulp of sandalwood. All My transcendental senses are overwhelmed in ecstatic pleasure by tasting You, who are completely decorated by beautiful qualities.’

The ecstasy of love for Kṛṣṇa is known as dhīrā and adhīrā, sober and restless. Such ecstasy constitutes the covering of Śrīmatī Rādhārāṇī’s body, and it is adorned by camphor. Her transcendental anger toward Kṛṣṇa is embodied as the arrangement of the hair on Her head, and the tilaka of Her great fortune shines on Her beautiful forehead.

CC Madhya 8.166, Purport: “The love of the gopīs for Kṛṣṇa is full of transcendental ecstasy. It appears to be a brilliant jewel, and enlightened by such a transcendental jewel, Rādhārāṇī’s body is further perfumed and decorated with kuṅkuma. In the morning Her body is bathed in the nectar of compassion, in the afternoon in the nectar of youth, and in the evening in the nectar of luster itself. In this way the bathing is performed, and Her body becomes as brilliant as the cintāmaṇi jewel. She is dressed in various kinds of silken garments, one of which is Her natural shyness. “Her beauty is more and more enhanced, being decorated with the red kuṅkuma of beauty itself and the blackish musk of conjugal love. Thus Her body is decorated with different colors. Her ornaments embody the natural symptoms of ecstasy—trembling, tears, jubilation, stunning, perspiration, faltering of the voice, bodily redness, madness and dullness. In this way Her entire body is bedecked with these nine different jewels. Over and above this, the beauty of Her body is enhanced by Her transcendental qualities, which constitute the flower garland hanging on Her body. The ecstasy of love for Kṛṣṇa is known as dhīrā and adhīrā, sober and restless. Such ecstasy constitutes the covering of Śrīmatī Rādhārāṇī’s body, and it is adorned by camphor. Her transcendental anger toward Kṛṣṇa is embodied as the arrangement of the hair on Her head, and the tilaka of Her great fortune shines on Her beautiful forehead. Śrīmatī Rādhārāṇī’s earrings are the holy names of Kṛṣṇa, as well as the hearing of His name and fame. Her lips are always reddish due to the betel nut of ecstatic affection for Kṛṣṇa. The black ointment around Her eyes is Her tricky behavior with Kṛṣṇa brought about by love. Her joking with Kṛṣṇa and gentle smiling constitute the camphor with which She is perfumed.

CC Madhya 8.170, Translation: “Śrīmatī Rādhārāṇī’s personal beauty is the reddish powder known as kuṅkuma, Her affection for Her associates is sandalwood pulp, and the sweetness of Her smile is camphor. All these, combined together, are smeared over Her body.

CC Madhya 17.212, Translation: The female parrot said, “Śrīmatī Rādhārāṇī’s affection, Her exquisite beauty and good behavior, Her artistic dancing and chanting and Her poetic compositions are all so attractive that they attract the mind of Kṛṣṇa, who attracts the mind of everyone in the universe.”

CC Antya 1.136, Translation: “‘Springtime had arrived, and the full moon of that season inspired the Supreme Personality of Godhead, who is complete in everything, with new attraction to meet the beautiful Śrīmatī Rādhārāṇī at night to increase the beauty of Their pastimes.’”

CC Antya 1.169, Translation: “‘The beauty of Śrīmatī Rādhārāṇī’s eyes forcibly devours the beauty of newly grown blue lotus flowers, and the beauty of Her face surpasses that of an entire forest of fully blossomed lotuses. Her bodily luster seems to place even gold into a painful situation. Thus the wonderful, unprecedented beauty of Śrīmatī Rādhārāṇī is awakening in Vṛndāvana.’

CC Antya 1.170, Translation: “‘Although the effulgence of the moon is brilliant initially at night, in the daytime it fades away. Similarly, although the lotus is beautiful during the daytime, at night it closes. But, O My friend, the face of My most dear Śrīmatī Rādhārāṇī is always bright and beautiful, both day and night. Therefore, to what can Her face be compared?’

Externally She moved Her eyebrows and made a show of rejecting Kṛṣṇa. In this mood Rādhārāṇī looked very beautiful

Nectar of Devotion 31: Once when Śrīmatī Rādhārāṇī was standing on the bank of the Yamunā River in the forest of Vṛndāvana, She was attacked by Kṛṣṇa, who was stronger than She. Although She externally expressed a disturbed mood from this incident, within Herself She was smiling and feeling great satisfaction. Externally She moved Her eyebrows and made a show of rejecting Kṛṣṇa. In this mood Rādhārāṇī looked very beautiful, and Śrīla Rūpa Gosvāmī glorifies Her beauty. This is an instance of exhibiting varying feelings in ecstatic love, although the cause is one only—Kṛṣṇa.

Let us all look upon the transcendental beauty of Śrīmatī Rādhārāṇī.

Nectar of Devotion 44: The beauty of Śrīmatī Rādhārāṇī is described as follows: "Her eyes defeat the attractive features of the eyes of the cakorī bird. When one sees the face of Rādhārāṇī, he immediately hates the beauty of the moon. Her bodily complexion defeats the beauty of gold. Thus, let us all look upon the transcendental beauty of Śrīmatī Rādhārāṇī." Kṛṣṇa's attraction for Rādhārāṇī is described by Kṛṣṇa Himself thus: "When I create some joking phrases in order to enjoy the beauty of Rādhārāṇī, Rādhārāṇī hears these joking words with great attention; but by Her bodily features and counterwords She neglects Me. And I even possess unlimited pleasure by Her neglect of Me, for She becomes so beautiful that She increases My pleasure one hundred times."

I have seen the beautiful lotus eyes of Śrīmatī Rādhārāṇī.

Nectar of Devotion 50: In the Vidagdha-mādhava, Second Act, verse 31, Kṛṣṇa tells His friend, "My dear friend, what a wonderful thing it is that since I have seen the beautiful lotus eyes of Śrīmatī Rādhārāṇī, I have developed a tendency to spit on the moon and the lotus flower!" This is an example of conjugal love mixed with ghastliness, but there is no incompatibility.

When Kṛṣṇa comes before Rādhārāṇī, She becomes so much engladdened by seeing the beauty of Kṛṣṇa that She becomes more beautiful

Lecture on SB 1.2.8 -- New Vrindaban, September 6, 1972: God is engaged in enjoying with His eternal consort, Śrīmate Rādhārāṇī. This Śrīmate Rādhārāṇī is enchanting Kṛṣṇa, and Kṛṣṇa is enchanting Rādhārāṇī. This is the business of God. Duhe (indistinct) lage hari (?). In the Caitanya-caritāmṛta it is said that when Kṛṣṇa comes before Rādhārāṇī, She becomes so much engladdened by seeing the beauty of Kṛṣṇa that She becomes more beautiful, and as soon as Rādhārāṇī becomes beautiful, Kṛṣṇa becomes engladdened and He becomes more beautiful. So unlimitedly there is competition of becoming more beautiful, duhe lage hurai (?). That is the state. Competition. Because in the spiritual world everything is unlimited. So unlimitedly both of them becoming beautiful and both of them enjoying unlimitedly.

The Nectar of Devotion -- Calcutta, January 30, 1973: This is the competition going on between Kṛṣṇa and Rādhārāṇī. By Rādhārāṇī, seeing the Rādhārāṇī's beauty, Kṛṣṇa becomes pleased, and Rādhārāṇī, when She sees that Kṛṣṇa is very pleased, She becomes pleased. She becomes more beautiful. And Kṛṣṇa wants to see. In this way there is competition. This is rādhā kṛṣṇa-praṇaya vikṛtir hlādinī śaktir asmād ekātmānāv api deha-bhedaṁ gatau tau [Cc. Ādi 1.5]. This is the exchange of Kṛṣṇa's pleasure potency. Śrīmatī Rādhārāṇī is the manifestation of pleasure potency of Kṛṣṇa.

Please also see:
The Indescribable Beauty of Śrīmatī Rādhārāṇī