Green Girl -- in progress --

I'm currently working on this one, by i-Pad of course
This is my very first CG in this year. And I hope I could finish it before the coming final exam next month.
So, before finishing this painting, I really need helping from you guys!!
If you guys have some time, could you give me some opinions or advices for all these questions?

Does the hair color and shading already match to the whole painting?
Which colors should be added more?
Does her face look weird somehow?!

Thank you for supporting me