License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Stefano della Bella. Three fragments of friezes; on top, a grotesque head of a man, a skull of a ram at bottom left and a chimera at bottom right, plate 2 from "Friezes, foliage, and grotesques" (Frises, feuillages et grotesques), ca. 1638–43. The Metropolitan Museum of Art.