Edgar Degas, Paul Lafond and Alphonse Cherfils Examining a Painting, c. 1878–80, oil on wood panel, Cleveland Museum of Art, Cleveland. https://dartabase.art/cite/cleveland/135238

Edgar Degas, Sheet of Studies and Sketches, 1858, graphite, pen and dark brown ink, and watercolor on thick ivory wove paper, Cleveland Museum of Art, Cleveland. https://dartabase.art/cite/cleveland/128808