What's a good hair style for a 20 yr. old, thin hair, kind of oval face?

I need something new! I am starting to work in a high school and I look younger than my students...I need something adult-like, but I have thin hair!What's a good hair style for a 20 yr. old, thin hair, kind of oval face?
What about a Zac Efron style? It really suits guys with oval faces!What's a good hair style for a 20 yr. old, thin hair, kind of oval face?
Hairstyle/cut ideas %26amp; suggestions, based on face shapes

http://geebal.blogspot.com/2007/12/face-/a>
spikes. what colour hair?