Interesting style. Yes, something is off—the lighting. The human figure has an backward tilt for balance, you have it right on the side view. The problem on the front view is the quads are lit. This makes it look like they're bent, like he's squatting or something.
Another thing is the abs, it looks like you're trying to squeeze a six pack into a 4x4 area and 2 colors to work with. Would take some figuring out but at that scale best bet is a solid shape. I made an alternate to the right.
Make sure the head casts a shadow on the upper chest. And watch your banding on the side view.
