Torso on the vampire is too long, legs should be longer, I say.
Both are a bit pillow-shady. Where's the light source?
There's a lot of jaggedness throughout both, eg the werewolf's head/face, vamp's pants. You have strong shadow cutting into highlight.
The werewolf's arm on our left has some problems around the wrist. What's happening there? It looks way too thin.
Here's a bit of an edit I did on the vamp. I noticed your palette has a number of very similar colours that could be merged, 3 of which are near-blacks.
