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 cows in center, followed by two peasant women and other cows in the river to left, from "Six Animal Subjects" (Six Sujets d'Animaux), ca. 1643–48. The Metropolitan Museum of Art.