Hmm, I can't pick out any glaring flaws, so I'd just say to experiment a lot (which you often do) to find ways to refine your style. Also, I'd play more with color. Your low-saturated look is easy on the eyes, but I think you could work more on shifting the hues of colors while changing the value. The latter looks a bit muddy in cartoon drawings and shifting the hue to a dominant color while shading would make a nicer image.

Good gravy this is a long comment.

I would say based on the drawing here, you could work on smoothing out lines (like on your drawings chin and top of the mouth). Also, your hand looks a bit out-of-place, so maybe make the pointer finger closer to the thumb.

but thats just what i think! your art looks good!

You're a very good artist as is, but however there is some things you should work on. One recommendation is to do a lot of background art, secondly work on your shading.

Ehhhh heres an idea, try doing some realistic stuff :3 its hard >.<