I entirely disagree with the broken proportions comments, as the proportions seem passable for what they are, though obviously making no attempt at being realistic. There are a couple specific proportion flaws, such as the character's left arm being much longer than his right, but that ain't too hard to fix at this stage.
What I am concerned about, though, is that it is unclear what perspective you're going for. I'd assume he's supposed to be platformer, but it's hard to tell exactly, as he currently appears to be walking somewhat toward the viewer.