Sick stuff, dude! You've got a pretty good understanding of light, color, and value. And you've got some cool design ideas too. Your figure sketches are spot on!
So three things:
1.) I tell everyone this because it's immensely helpful: break down forms into simpler forms
. Like as in "I don't have to think about it" kind of simple (spheres, cylinders, cubes). Something like this:
My friend beat this into my head about a year ago, and it's been so helpful ever since. I see that you're starting to break the figures down into constructive forms, and that's good. It just takes a lot of practice to find out your own system of figure drawing. I think the best way I learned is by thinking of bones and muscles as simple machines, and I got this concept from how Ron Lemen teaches anatomy and figure drawing.
2.) Someone pointed out that you should try your best to bring things to a finish. I think part of it is because a lot of your digis have that soft, rough organic brush marks, but not a lot of cleaner, harder edges for contrast. And someone else around the forums posted a really helpful tip on how you can quickly get to a finishing point:
It's important to use hue, saturation, value, texture and gesture to lead the eye to the most important spot(s). If you do this you can get a finished image really fast.
To the most important spots:
3.) This is more of a meta-learning thing: who are your influences?
Keep up the good work!