Being female I'd have to say it would depend on the structure of the person's face and the shape of the body that would determine whether or not a hair cut would suit them. Some girls that are thinner can pull off a "pixie" hair cut and some girls may look better with longer hair but sometimes if it's too long it will look very bad.... almost hippie looking, with super long, board straight hair.
Like I said, it all depends on how the person's face and their body shape.
I like it short on both men and women. The shorter the better. Short = less shampoo = smaller hole in the wallet and everybody appreciates that, right? Personally, I don't like mine to get past 2 inches and short hair on women looks more pretty to me. But that's just me. :)
As a rule, I like women with long hair. Flowing, shimmering as it cascades down. Just lovely. It's great to grab while I tie her hands...oh, uh,... forget I said that last part.
oh shit that's long. I know a guy who once had hair that long. Before he had it cut he put it up in a gigantic comb. It was a great day. But I digress. I prefer long hair on girls with a rounder facial structure, and short hair on girls with a more slender facial structure but they also have to be able to pull it off. Think Keira Knightley.