Before deciding which teen hair cut is right for you, you need to take into consideration of how that particular hair cut will look with your particular face shape. People often foolishly overlook that small, simple step before jumping into a new and exciting hair cut.
But truthfully, it is probably the most important thing you can do for yourself before your daredevil dive into your new teen hair cut.

So basically all you need to do is figure out what shape your face is. There are three different facial shapes: round, square and long. If you have a round face, the best look you can achieve is by adding fullness and volume to the top of your head. This adds length to your face so it doesn’t seem so round and, well, ball like.

Styles you should avoid if you have a round face are those that are flat on the top and also styles where the hair is very long and straight. Those don’t really compliment round faces, instead they accentuate the shape, which is not that good.

If you have a longer face you should shoot towards hair styles that are soft and airy. Something short and flowing is the best way to go. You should avoid styles with center parting. Straight shoulder length hair is generally unflattering, as it tends to make your face look a little too long and not give much distinction to your look.

For all you square faces out there you have the most styles to choose from that flatter your facial shape. Some examples are hair styles that are shoulder length and flicking outward at the ends or pixie cuts that are ear level and flicking away from the face. You can even go for hair that is off to one side or with diagonal fringes.
There aren’t too many choices for square faces to go wrong with.

Taken from Teen Hairstyles