give yourself more canvas size to work with, it looks like you've distorted her features to make her fit in this box (if you want 100x100, crop afterwards). She doesn't have nearly enough forhead/cranium, which are rather large structures on modern humans. the nose appears at a head-on angle, while the head is shown at an almost three-fourths angle. the ear is too small and is leaning to the right. neck shows that you're vaguely aware of the underlying structure, but you've reduced it to symbols rather than forms. the collar bones shouldn't be that high up, and the trapezius muscles seem to be absent, or at least melded to the neck.

best thing to do is reference, reference, reference. compare your image to images of actual human females and adjust accordingly. study the underlying bone and muscles structure that composes a human face.