Pretty good head overall, just a few suggestions on what to look at..

1) The eyes seem just abit to small for the overall size of her head.

2) The jaw line needs to be a bit more defined as it is right now it just blends right into the neck. Also they are just a bit to sunken in the front view. Remeber most women have soft lines in there face, unless they are a body builder with no body fat=)

3) The ears are to forward. Try moving them back and you will find the it will help a lot when you want to defind the chin.

Good stuff keep it up=)