Radhapriyamayurasya Yatra Radhekshanaprabham.
Vibharti Shirsa Krishna Stasya Chudanibham Satah.
- Krishnayamal Tantra (16.7)
Shri Krishna envisions the divine eyes of Shri Radha in peacock feathers. Therefore, Shri Krishna wears peacock feathers on His head.