What? Stick figures are great for laying out proportions and pose. Obviously they are covered over by the final art, but they are a perfect way to get the pose balanced and proportioned correctly.
As for the piece posted, not bad. The upper body seems good, but the legs need some work. They don't feel balanced, and the guy looks kind of like he is sitting down. All of the stick figure lines look shakey, try using the line tool for each segment of the limbs (not the spine). On the outline, the legs are too big and lack definite shape. If you were trying to make pants, then I suggest at least getting the general shape of the underlying form first, then drawing the clothes on top. Look again at anatomy reference material, and see how each segment of the body is shaped. For instance, the calf muscle gives the upper part of the calf some bulk, that tapers off into the ankle. Right now, your legs are just blobby, and drawn without consideration of what a leg actually looks like.