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 woman looking over a man's shoulder at the letter in his hand, illustration for 'Coleccion de Cartas Amorosas Cuaderno No. 10,' published by Antonio Vanegas Arroyo, ca. 1880–1910 (a later impression). The Metropolitan Museum of Art.