You're only paying 300k. For a pixel sig that's not very much at all. You can't expect to get better then that. Actually I think that sig is worth more then 300k looking at his shading skills.
That's not good at all. :S No shading, his arms look like he's deformed. 4/10 Sorry. Just try to look at real photos and try to get the proportions(sp?) right. And then look at where there are shadows when there are different lightsources.