Musnad Ahmad 5:234

'Affan and Hasan ibn Musa narrated to us, they said: Hammad narrated to us, from 'Abdullah—meaning Ibn Muhammad ibn 'Aqil—from Muhammad ibn 'Ali, from his father, who said: "The Messenger of Allah (ﷺ) had a large head, large eyes, and long eyelashes—Hasan said: 'eyelashes'—with a reddish tint in the whites of his eyes. He had a thick beard, a bright complexion, and thick palms and feet. When he walked, it was as if he were walking on an incline—Hasan said: 'he would lean forward'—and when he turned, he turned with his whole body."