License, verbatimPD
The National Gallery of Art: open access image with no usage restrictions under the NGA's open access policy (openaccess=1 in the Gallery's published_images dataset).
Francisco Goya. Un caballero espanol mata un toro despues de haber perdido el caballo (A Spanish Knight Kills the Bull after Having Lost His Horse), in or before 1816. National Gallery of Art, Washington.