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. Plate 8: Four small heads, a soldier at upper left, a Turk with a turban and beard at upper right, a bearded man in profile at bottom left, a young woman in profile at bottom right, from "The Book for Learning to Draw" (Livre pour apprendre à dessiner), ca. 1649. The Metropolitan Museum of Art.