Raphael, The heads and hands of two apostles, c. 1519–20. Black chalk with over-pounced underdrawing with some white heightening, 49.9 x 36.4 cm. © Ashmolean Museum, University of Oxford

Raphael, The heads and hands of two apostles, c. 1519–20. Black chalk with over-pounced underdrawing with some white heightening, 49.9 x 36.4 cm. © Ashmolean Museum, University of Oxford