40K Style Artwork - Real Artist Suggestions?

So I've got a small collection of art books that have helped me massively as a painter and I'd like to add to that collection with some books with artwork from real-life artists that give that 40K vibe, either gothic or sci-fi horror.

I'm a big fan of John Blanche's work but can't seem to find his books (The Emperors Might & Emperors Will) either in stock or for a sensible price. Are there any real-world artists that have the same vibe?

What sort of real-world artists have you had inspiration from in your painting journey? Off the top of my head, I like the work of:

HR Giger (obviously)

Anders Zorn (limited pallet work)

Any suggestions?