There's a pdf someone made using the art to incorporate into dnd. You might be able to Google around for it.

Here ya go! https://www.reddit.com/r/DnDHomebrew/comments/3umzhk/the_compendium_of_angels_a_49_page_book_with_lore/

Honestly, any of that artist's works would make good characters...I'm looking at Azazel with his pet goat and wondering when I can use it for a campaign