ubar-quick edit incoming..

Your piece has some huge problems in the following departments:
- palette: you used a blue as if it was brighter than the more green blues in the face which looks pretty strange..
- anatomy: theres much wrong here, but being bad at anatomy too I couldnt fix everything. Still the nose and the upper area of the mouth seem very out of place.
- the hair: dont think of hair as one mass with a few extremities sticking out.
- shading: if you dont know where the light and shadow should be placed, try finding references
This was like I said only a very quick edit, and actually rosses was much better, but since you didnt want to change the perspective, I thought I could show you that you can fix many issues without changing the perspective.
The hands might be the biggest problem I didn't touch here.