Classic paintings: everything used on Standard Ebooks productions is old enough to be in the US public domain. The artists are in the colophons if you want to find out more.
Is there a back story to the Gormenghast collection not being available: https://standardebooks.org/collections/gormenghast
The comment given was:
This book was published in 1946, and will therefore enter the U.S. public domain in 17 years on January 1, 2042.
No great drama, it just caught my attention, I like the series and wanted to check the art and the copy against what I have here in book form.
* https://standardebooks.org/about/standard-ebooks-and-the-pub...
https://www.artic.edu/collection?q=Redon - I see he also made a series of prints, "To Edgar Poe"!
https://en.wikipedia.org/wiki/Robert_Delaunay
...and some seascape with a ship in it, wasn't fussed about that one.