Hi man,
It's not bad, but I find the overall image flat and dull. Your lighting source are weird, and even though you spent time painting each elements of the characters, it still looks flat.
I suggest you to correct your values, and for your next one, try to think and paint the global body, before going to details on each parts. You can use a layer full of black on Saturation mode on top of all your layers during your painting process, to check regulary if your values are correct. Help your with a photo reference on the side, from yours of the web, depending your sketches and wish.
Hope it helps you a bit. Keep going ! 
