For getting immediate attention, long hair always has an advantage. Otherwise, there's a different answer for every size and shape of female, the'res no one answer. Short hair on an Italian woman, for example, can be captivating, but I wouldn't recommend it for most Nordic type women...
I have to start off by saying I like all hair styles, but my favorite would have to be around middle of the back length. I don't like curly or updos, but I do like wavy or straight. My favorite hairstyle of all is probably what I would call braided ponytail...something like this link
I like everything but I have a big soft spot for long and wavy hair, I'm talking hair that's like middle of back long, I think it just reminds me of a princess in a fairytale and when I see it I automatically think it's beautiful.
depends on her face shape and hair really... Some women just have a longer face and can do more curls... Some have a rounder face and fuller hair makes them look heavy. Like I said it's as much to do with that as anything..
There's something about women with long hair in ponytails, by far my favorite style. I don't see why more women don't sport ponytails, it's really easy to do and must feel good not having any hair on your neck, especially on hot summer days.