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. Two friezes; at top, a grotesque head of an old man to left, a lion head to right, at bottom, a ram skull to left, a grotesque head of a man to right, plate 5 from "Friezes, foliage, and grotesques" (Frises, feuillages et grotesques), ca. 1638–43. The Metropolitan Museum of Art.