Alex. There are two big glaring problems that scream NOT DONE to me.
Firstly, the wasted colors.
You've got one color (red) being used on just two pixels. COMPLETE WASTE. You also are using straight boring color ramps.
Purple, Yellow-Salmon and some dull Browns. There's an odd sanitized look about it. Use the colors together a bit.
Secondly, there anatomy is quite... wonky.
The guy has a rub for an arm. There's no indication of an elbow. The arms also seem a little short. And the hands malformed.
You're small piece was looking better than this one. It had similar flaws, but they weren't as bad.
I suggest you go back to the smaller one and try again. Try drawing this guy out on paper too!
Oh yeah, eyes are in the middle of our head. Not the top. I assume this guy is human right?