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).
Giovanni Battista Piazzetta. Figures Deciphering an Inscription, with Two Women Seated [Study for Oeuvres de Bossuet, IV], c. 1736. National Gallery of Art, Washington.