What are the best hairstyles for a teenage girl?

I'm not sure who you were hoping to answer this question, but as a teenage girl I have found that SIMPLE is a really good thing. Too long hairstyles take too much time and effort to make it look "perfect". I haven't had it really short, but I would imagine there are drawbacks to that, too.

I think that for most girls medium length is the best. It's long enough to put braids and ponytails in, or more elegant styles. With a few layers that can be brushed out to frame your face it can look great up or down.

I think the main thing is to try and keep your hair healthy and trim the split ends when it starts looking sparse or dry. Besides that, I think the ball is in your court.

There are also some websites than can help you decide depending on the shape of your face.

Well, the best hairstle for a teenage girl would have to be whatever they would feel comfortable wearing for a period of time. Hairstyles vary from person to person. Lets say some girls can not devote much time for hair in the morning, so they should go with a simple haircut, that does not need much taming. If a teenage girl did have enough time, when getting ready, she could possibly get a hairstyle that would take little time. Overall, a teenage girl should pick a reasonable hairstyle, for she will be the one wearing it.