Some women can get away with a haircut like that,others can't.I had a short cut once,everyone liked it.But my personality is more wild and free as opposed to short and neat.So now I wear my hair more to suit my temperment and personality.My avatar photo is 7 months old.I want to grow my hair longer yet.
Yes a short cut hair style make a lady more sexy than other but it is also true that it depends on all's personality. All physics can't get it. and there is no doubt that this lady is beautiful.
Pixie haircuts only suit certain face shapes. If the girl has a round face then it's best to keep her hair long, or at least frame the face and not expose it as much as shorter hairstyles would. For Kiera it works because she has good bone structure. But if say, a famous Japanese pop star did it it wouldn't have the same effect.
Hair styles depends also on people's personality and attitude... and if you look good at it then go ahead and have that style.