License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Jean Le Pautre. Two Designs for Frieze Decorations with Sea Creatures, of which one features Neptune and Amphitrite, from "Frises, feuillages ou tritons marins antiques et modernes", ca. 1640–82. The Metropolitan Museum of Art.