License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Thomas Sully. Sketches of Friezes and Groups of Figures in Three Tiers, Some Antique, Some 16th and 17th Century Genre (from Sketchbook), 1810–20. The Metropolitan Museum of Art.