License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Jacques Callot. Une Sirène entre Deux Vaisseaux (A Siren between Two Ships), plate 17 from "Lux Claustri ou La Lumière du Cloitre" (The Light of the Cloisters), 1621–35. The Metropolitan Museum of Art.