Crop the empty space and increase the contrast a big. There's a lot of shadow here already so the lit portions need to pop.
It feels like there's too much empty space around the image. You could either fill in the walls further with texture, or crop the image to get more focused on the door/creature.
Othewise it'd be gallery-ready.
This looks unfinished, i dont think I would submit this to the gallery in this state.
Thanks! I appreciate the feedback.