Skewedness:

Her left eye is rounder, that's true, not perfect though and I wouldn't mentioned it if the other would be good, probably... It's the smallest thing of all.
Skin tone... you know, I started to learned about it but I rarely criticize such thing, I don't have enough confidence for that, skintones can be so very different. _I_ would do it otherwise, more orange-ish base color and more saturated shadows to give a warmer look BUT there are somewhat pink skinned people (though your pink seem a bit too much to me) and as far as I know the "more darker, more desaturated" approach is valid as well. I didn't find anything I could give a useful crit even if it looks muddy to me but I checked the colors last time and it seems you didn't use black... It's sketchy and unfinished, I don't know how would it look when ready and I targeted the more important because more basic issues anyway.
But if you ask, lighting and shading... something is very off. The light comes a bit from above and from the left, right...? The bottom of the chin needs more shadow then, the part above the mouth should be more lit than the one below... But I think I can't say how to color a face properly if you don't know it. And it's not like I know that, I just started to learn it. To me, face planes and of course, studying photos helped a lot. Many photos don't help much though, too much diffuse light and too many light sources to see what's going on.
Oh one more thing. Maybe you know it but the mouth has no shadows, structure at this point. The corners should have a massive shadow where the lips curl into the inside of the mouth or how should I call that... And the outside of the corners is pretty interesting too and many people don't put enough attention to it.
I can give you or overpaint or size and position change pic if you want but maybe I'm not good for your confidence... I'm a critic, not a nice one and I do everything for my own benefit I think... Though I really want to help (because that feels good to me ofcoz *shrug*).
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