I think your horns need a lot more depth, they look completely two-dimensional. Just add some shadows and it would already start to look much better. Good luck!

Not sure about the tattoo/swirl brushes.. I think if you shaded them better or used a different opacity filter to make them blend more..they seem to be floating off his face and not really part of it..but the overall work is quite nice.. good luck

The tatoos on his face look fake, you should work better on them ^^

The swirl things look really fake, you might want to adjust the blending

cooooooool

For the tatoos try the blending options bevel and emboss with inner glow and a sfot stroke. Also they should be darker by a little bit. altogether (with that fix) it's good work.

Thanks Sparklen for the idea for the tats. I really couldn't think of anything else to do with them. I will try that next time.