Up is practical it keeps the hair out of your face which is nice BUT down is beautiful showing off the hair yet can be a bit annoying to the one having the hair as they have to brush it out of their face and what not.
Most Helpful Girl
It depends on her face shape. Sometimes hair up can elongate her neck and she looks beautiful... other times a woman can have it down (various, from framing her face, to being curly) and she can look pretty. It's a tough choice... I usually do both.