Ok, where to begin... This piece poses alot of challenges for you I think, because it draws upon many different elements of figure drawing and drawing techniques and theory.
You're going to need to read up/study anatomy and perspective, to really make the image properly.
It might help if you tell us what is going on in the picture, too. Basically the anatomy is off, the perspective is off, you've used the line-tool in too much of the lineart composition, which has created blocky, rough lines. The line tool can be a bit of a time saver in some situations, but really it's best to get used to drawing everything with the pencil tool. Also the composition is unclear, the person on the right seems to be facing away from the person on the left, yet he's thrusting an axe towards him.
I'm kind of uber tired at the moment, but I might sketch up a rough mock of what I think the picture would look like, based on what I believe is going on in the picture and what your intentions are.