"Tamajaq Nomad" by Catherine L. Mommsen is licensed under CC BY-NC 2.0.
"Unfinished Portrait" by Helene Schjerfbeck is available through the public domain via Wikimedia Commons.
"Cross at Sunset" by Thomas Cole is available through the public domain via Museo Nacional Thyssen-Bornemisza, Madrid
"Jaint Jerome" by Leonardo da Vinci is available through the public domain via Wikimedia Commons.
"Portrait of a Lady (unfinished)" by Gustav Klimt is available through the public domain via Wikimedia Commons.
"The Proposal, Unfinished drawing of a horse and rider" by Richard Parkes Bonington is available through the public domain via Wikimedia Commons.
"Unfinished Painting" by Isidor Kaufmann is licensed under CC BY-NC-SA 2.0.
"Mallard, unfinished" by Magnus von Wright is available through the public domain via GetArchive, the creator of Picryl.
Artwork in artist page of Nyx Zhao are all provided by Nyx Zhao themselves.
Self-portrait of Marco Lam in the home page and about page is provided by Marco Lam himself.