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. Broadsheet, on recto artist and artisans in hell with objects relating to their profession entitled 'The artistic purgatory, where the calaveras of artists and craftsmen lie', on verso skulls relating to different professions, ca. 1895–1900. The Metropolitan Museum of Art.