This is really good! I really like how you have a different style than I regularly see. I also really like how you did the lighting on the cat. The only thing that I would suggest you change would be the eye size. Maybe make the eyes a bit smaller (but that's mostly my personal opinion on eyes :3 ).
The background is really good. I like how it sets the mood of the picture and casts light correctly with the light source. I suggest that you make the background match the cat more, though. Separately, they are both amazing, but together the cat seams out of place. Maybe outline the cave too. Good work, I really like this!