License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Thomas Sully. Woman Sketching; Two Women Reading; Portrait of a Man (after Van Dyke?); Half-length Female Portrait; Two Equestrian Figures Leading a Horse (from Sketchbook), 1810–20. The Metropolitan Museum of Art.