High School Seniors are the best at being creative and trying new things. What do you want your Senior Portraits to say about you at this time in your life? Have fun with it, (but also get some classic shots mixed in for Mom) Remember this portrait will be on the wall in your family home for a long time and then passed down to your children, and so on.
Make sure the quality and skill of your photographer is up to par. Sure, you can get from point A to point B in a cheap Prius, or you can ride in a Lamborghini. They both will get you there, but how much will you enjoy the ride?