Yeah, I think the background helps with the darker atmosphere of the piece. As for the colors left maybe I'll try adding more, but  there is not much space. Thanks for the constructive criticism.

Black is spooky.

The piece looks very pixellated, though that might be your style. It's hard to pull off horror at such a low res, so then you really need to go for broke on the lighting.

I guess we had the same idea for the challenge hehe
 

looks good, shame about the black bg (why not transparent?) and I'd add som shading to the shirt since you have some shades left to use.