K well if your having troubles with getting the shading right... theres a perfect example/reference right under your nose. On the right arm of Akira is where the pillow shading is really bad, so look at Ryu from Ninja Gaiden in your sig - his arm has a very clear light souce. Although your shadows don't need to be as dark try and get your characters shadows to look almost as natural as they do on Ryu.

Wow you learn fast, thats about 200% better. Fix the lighting in his hair for now, when I get home from school i'll take a closer look at the rest - his hands need to be fixed as well -

NP, I have settled down and have been home for awhile - so I threw this together for ya. (you will need to save it and zoom in)
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RED
Red shows the difference between the flow of the arm, your hand suddenly juts where its unnatural. When you go to punch someone you want your hand to be in a comfortable position and sturdy- that being the most common position - which is flat. If you hold your hand in a fist, try and line your *pointer finger knuckle up with the top of your arm so it almost looks like your forearm doesn't stop - that's what your characters hand should be like. Once again your sig was the perfect example.

BLUE
Blue shows the difference between proportion in the arm, your characters forearm is extremely long which can look very unnatural. By fixing the hand your characters arm will look much better, but its still not quite natural. If you want you character to be long and lean then disregard this next part and just fix the hand. (sometimes emphasis can be to your advantage)

*If you want your character to be shorter but with better proportions - it starts with the pelvis area. If you noticed - the area where the zipper would be on jeans is really long on your character, all you really have to do is shorten that area and its good to go - this should be quite easy because that area is covered by a shadow and will be really easy to fix up.
" But wait now his arms are WAY to long!"
To fix that all you need to do is shorten his forearms, by doing so it will also fix the arm proportions.*

BTW I really like your character so far =]

I think I'm finally finished
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I'm definitely going to animate him. He's going to be the main character of my game I'm programming.

Kirby I threw together quickly.
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Kirby I threw together quickly.
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The shade on the left foot doesn't match the light source actually and the arm outline is stuck to one of Kirby's cheeks

The mouth being a square looks really bad, and the outline needs some smoothening in some places (on the top of the main 'body'). Other then that it's pretty good, but I feel like you could drop a few uneccesary shades if you want too.