I知 not really sure what you want here. The picture itself is very cartoony, as seen by your plain coloring (except for the stripes on the shirt, pretty difficult shading there) and the hyper cephalic proportions. There痴 really not too much I can do to make it look realistic without starting over (is that what you want?). I can show you how I would improve it, while still leaving it in a relatively cartoony style.
First off, I知 going to reshape his body with a big brush, using the color I want for his outline. (I知 going with a darker color than the one you used to outline his face, since the contrast will be better this way)
I知 reshaping him to make his pose a little more natural (notice I知 giving it a very slight S curve).
I think his original shoes look fine, so I left them in (with a few slight modifications).
Now, I知 going to add details like the interior colors and the stripes on his shirt. (Them stripes gonna be tough to animate, dawg) I also changed the shape of his arm and darkened the skin tones slightly.
Lastly, I値l work on his face and add all the details. I think we need to be able to see his other arm, so I値l add that, too. I tried doing his eyes a couple of different ways, but I like them this way. What do you think?

total colors: 9
face/arms: 3
shirt: 3
pants: 2
shoes: 1 (other colors are from the shirt)
Hope this helps.
Ian