License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
José Guadalupe Posada. A skeleton wearing a cape speaking to a frightened man with a cane and backpack, illustration for 'El Doctor Improvisado (The Impromptu Doctor)' edited by Antonio Vanegas Arroyo, ca. 1894 (a later impression). The Metropolitan Museum of Art.