Andrea del Sarto (1486–1530), Study of a Nude Man Seen from Behind, Leaning on a Surface, and a Separate Study of His Head, ca. 1520. Red chalk, with some black chalk, 11 x 6 15/16 in. (27.9 x 17.7 cm), Recto . The British Museum; bequeathed by William Fawkener, 1769. © The Trustees of the British Museum