License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Honoré Daumier. Looking at a Manet painting, from 'Sketches from the Salon,' published in Le Charivari, June 19, 1865, June 19, 1865. The Metropolitan Museum of Art.