License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Joseph Heintz the Elder. Satyrs and Nymphs; verso: partial counterproof of Heintz's "Studies for the Flight into Egypt" in The Courtauld Gallery, London, ca. 1599. The Metropolitan Museum of Art.