Think Glee, think that cute nerdy look. But most importantly (and the person I'm modeling this on!) Justin Timberlake
The key to making this look work, is the big nerdy glasses and the bow tie. You want to look like your mum has dressed you. So in other words, if your stuck, get your mum to dress you! The big glasses with thick frames, are also key to this look, it makes you look clumsy.
Hair should have nothing done to it, but should be short cut.
Have fun nerds and nerdlettes!