Hey man;
I took the liberty to make an edit to show you some things you might want to try.
Basically i did some touch ups to the lineart, and try to define the areas,trying to keep the cartoony style thing you had going on.
I changed the colours defining more the areas, making some of them less saturated, others more, and overall, trying to make agood pallette usage. since right now it was around 18 i guess, and the edit has something like 11 or so, wich can be optimized too if someone wanted to be real anal about it.
Ummm, probably its not the direction you wanted to take, or maybe it was, but study the edit and reuse some of the things you find useful to yours.
Keep at it, its a fun little char!
-Krut