The Brothers Hildebrandt did _Urshurak_ along w/ Jerry Nichols:
https://www.goodreads.com/en/book/show/974764.Urshurak
16 paintings and ~80 b/w illustrations --- not sure if there's an ebook version or no.
There was an illustrated edition of Mervyn Peake's _Gormenghast recently as an ebook --- Amazon Kindle link:
https://www.amazon.com/Gormenghast-T.../dp/B07NHZVF5T
There was also Poul Anderson's _The Demon of Scattery_ with Mildred Downey Broxon, illustrated by Michael Whelan and Alicia Austin --- not sure if it's had an ebook release yet, but it's well worth tracking down.