>>1692812>>1692831>>1692838You really just need to follow the line for the hair and pinpoint where the nodes need to be placed to align both sides of the hair.
Other than that, you need to smooth out the hair a good deal, and add more curvature to them. Too many nodes and not enough handles. Make sure every node has two handles and you will avoid most of the problems. Same applies to the shirt and hands.
Anyway, I wanted my own interpretation with the white skin and shadows, so here is mine.