Leonardo da Vinci

Study for the Hands of Saint John
c. 1491-93

Five Character Studies ('A Man Tricked by Gypsies')
c. 1490-93

Drapery Study for the Right Sleeve of Saint Peter
c. 1493-96

Horse Studies with Measurements
c. 1490

Perspective Study, Sketches of Optical Phenomena and Calculations
c. 1480-83