I think in the books their hair cannot change. Nothing can. They are frozen, never growing.
Alice forever has a pixie hair cut - which fits since she was in an institution and they generally have short hair.
But I do like the new, improved looks for the vamps in New Moon.

Awesome poster. I like Bella's body language. Not so comfortable but not really pushing Jake away. And she like trying to hold herself together, like in the books.

Damn, are they going to make me buy this book now even though I have the hard cover.