Most noticeable thing in your figures is the length of those chicka legs. I would make them just a bit longer than you think you need and then they should be just about right.
In your digi face, the left (his right) cheekbone is sagging, got to watch that drift, I suffered with this (and continue to.. although I'm more aware of it now). Tuck it up a bit.
Fun sketches.. looks like you're going for the fantasy theme, I like that a lot.. I'm not sure which is more exciting, sci fi or fantasy.. =)