two distinct foreground people (large black wolf:1.4) AND (muscular man:1.1) in bluejeans, tight white t-shirt, boots, glowing axe, [dick bulge], outside, dry hills, moonlight, photo fantasy style, low angle, [anime], [cartoon]
1,000 of those resulted in 33 that were not awful and a few that are contenders.
That “low angle” seems to have resulted in a lot of dick bulge in one’s face. Or gems such as this:

I’ve removed it from the prompt and started another 1000.
I think I’ve reached the point of diminishing returns on this. If nothing else, they’re starting to blur together for me.
Some contenders (shrunk for scrolling sanity):

I like the multiple wolves. It has a glowing weapon. He looks big, but not mutated. The lighting is good. I fine with glowing aqua as a font color.

Same reasons. The dick bulge is a bit much, but not obscene. Wait a minute. Is that axe just floating beside him?

I like that one, but I can’t decide if the depth of field is a good thing or a bad thing. It’s also a little dark. The main guy barely has a head. Probably not, but I like it, anyway.

I can’t say why I don’t quite like it, but there is something. Not enough of his head, maybe?

I like this one, too. Multiple wolves. Good face shot. Glowing things. Well lit. I’m not sure how much of a problem the black arms would be. No one in the book has a race. You are free to assume whatever you’d like.

Also checks all the boxes.
That’s it for the really close ones. The others have something obviously disqualifying. I’ll use them as images for blog posts.
By way of comparison, here’s the current cover (still haven’t found a font I like):
