License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Marco Dente. Galatea riding in a shell pulled through the water by dolphins, a cupid below and four more above, at left a triton embracing a nymph and behind them a man on horseback blowing a conch, at right a figure blowing a horn and behind him a nymph riding on a centaur, ca. 1515–27. The Metropolitan Museum of Art.