1884–1887
National Gallery of Art, 1936
National Gallery of Art, 1792
National Gallery of Art, 1884
National Gallery of Art, 1940
National Gallery of Art, 1964
National Gallery of Art, 1657
National Gallery of Art, 1541
National Gallery of Art, 1937
National Gallery of Art, 1987
National Gallery of Art, 1967
National Gallery of Art, 1894
National Gallery of Art, 1939
![begonnene Skizze, wohl zweier Köpfe (Initial Sketch) [p. 15]](https://api.nga.gov/iiif/4cf44ce6-b646-498d-9e46-685543c62259/full/843,/0/default.jpg)
![0 through 9 [trial proof]](https://api.nga.gov/iiif/90c54f3a-c014-4152-8a9b-3e889b2f95cb/full/843,/0/default.jpg)
