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).
Ernst Ludwig Kirchner. Peter Schlemihls wundersame Geschichte: Kämpfe. Qualen der Liebe (Peter Schlemihl's Wondrous Story: Battles. The Agonies of Love), 1915. National Gallery of Art, Washington.