License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Thomas Sully. Study of Clouds; Two Female Nudes (after Michelangelo?); Two Half-length Female Portraits; Equestrian Figure with Two Men (from Sketchbook), 1810–20. The Metropolitan Museum of Art.