Hey alex! Amazing work! I hope see them finished soon. I just don't know about the forearm of the main character in the second painting... they gimme a strange feeling that is too short... I don't know.
Awesome as always man! I'm loving your designs and pencils!
As tehmeh said though the colours can use some work. Right now there are a lot of grays and not enough colour variation within the areas that do have colour. If you are hesitant to work straight colour then I'd recommend playing a bit around with various modes of layers (color, overlay, soft light etc). I like using soft light personally. You can also use the sponge tool set to either saturate or desaturate things selectively. And then it's usually a good idea to paint straight in colour on top of all those other layers on a normal layer to just fix things that still look a bit off.
"Complacency is the womb of mediocrity. " -- Jason Manley
"If you always put limits on everything you do, physical or anything else, it will spread into your work and into your life. There are no limits. There are only plateaus, and you must not stay there, you must go beyond them." -- Bruce Lee