The beauty of Krsna, as described by Lord Brahma and Srila Bhaktisiddhanta Sarasvati Prabhupada:

venum kvanantam aravinda-dalayataksam-
barhavatamsam asitambuda-sundarangam
kandarpa-koti-kamaniya-visesa-sobham
govindam adi-purusam tam aham bhajami

TRANSLATION
I worship Govinda, the primeval Lord, who is adept in playing on His flute, with blooming eyes like lotus petals with head decked with peacock’s feather, with the figure of beauty tinged with the hue of blue clouds, and His unique loveliness charming millions of Cupids.

PURPORT
The matchless beauty of Krsna, the Supreme Lord of Goloka, is being
described. Krsna, the all-pervading cognition, has a spiritual form of His own. The form of Krsna is not a fanciful creation of imagination formed after visualizing the beautiful things of the world. What Brahma saw in his ecstatic trance of pure devotion, is being described. Krsna is engaged in playing upon His flute. That flute by his enchanting musical sound attracts the hearts of all living beings. Just as a lotus petal produces a pleasant sight, so the two beautiful eyes of Krsna who causes the manifestation of our spiritual vision, display the unlimited splendor and beauty of His moonlike face. The loveliness that adorns His head with peacock feather figures, the corresponding feature of the spiritual beauty of Krsna. Just as a mass of blue clouds offers a specifically soothing, pleasant view, the complexion of Krsna is analogously tinged with a spiritual dark-blue color. The beauty and loveliness of Krsna is far more enchanting that that of Cupid multiplied a millionfold.

Brahma-samhita 5.30