License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Giuseppe Arcimboldo. Study of a Figure in a Niche (Saint Ambrose; recto); Architectural Studies: Four Alternative Designs for Fictive Niches and an Unrelated Design with Garlands (verso), ca. 1560-67, 1564–65. The Metropolitan Museum of Art.