the face mapping is low, If that is what you wish, keep it, and bother distorting it to counter the sphere distortion.
the hair is a spike, dont do it, make it curvy and flowy.
I dont know what the eyes are meant to be, and the face is simple, try to make the lines with more appeal changing the width of them.
if you are using gimp, you can do it easily by using the vector tool.