Hands...

Albrecht Dürer: 'Hand Study with Bible', 1506

Francesco Vanni:

'Two studies of hands playing a Lute', 1590s

' Studies of Erasmus' hands',

by Hans Holbein the Younger, ca 1523

Léonard de Vinci: 'Annonciation', 1472-75

Sigillum Maior Amicitia, 1800

link