Welcome to Gaia! ::

Perhaps it's just me, but when I look at the image it looks a bit flat.
The shades you chose for highlights and shadows are a bit subdued.

To emphasize certain shapes and features of the human body, you want harder shadows on places that are 'more covered' than others.

Basically, what I'm getting at is don't be afraid to color the clothes darker because it's natural. It's the same way for highlights. There can be different shades of highlights.

I think (I don't have the picture open as I type this. I looked at it then posted a reply, so I'm going off of what I remember) you have the right idea with your character's skin color. It looks more..'defined' for lack of a better word.

Anyway, I know I probably sound incoherent, so I apologize.

But, in general, the pic's pretty good~<3 just work on those shadows ;D

On the right (our left) side of her face, the shading is well-done. There is a good amount of depth.

However, I do agree with the others. Use a lot more contrast in your shading. Don't be afraid to experiment on that color wheel. Here, I'll offer you a tip on shading.



The diagram above was taken from my Photoshop CS2.

See how the arrows point to what would be better for light and dark? It's always best to pick colors yourself (dodge and burn don't work in most cases, dodge is turning a color white and burn is turning a color black). You can even transition to a dark purple in case you want to make some deep shadows. The same goes for a brighter blue to make highlights (if you were shading the color blue).

I hope that helped.
Experiment as much as you can with those colors. I see tons of potential!