Hairstyle for prom

I have short hair, (well its not that short, its a bob cut just under my chin). I have an oval face, I need a new style for prom. By the time prom comes my hair, MAY BE almost to my shoulders if I dont` cut it . (I have a light brown hair, RIGHT NOW) I already have a dress its a burgandy colour, it puffs out a little at the bottom, thick straps, goes straight across the front and back!
I`m wearing a silver necklace. I`m going to two proms and I don`t wanna look the same so I`m changing my outfit a little (ie. having a shall at one and wearing gloves to the other one) and I need two hairstyles, I have one in mind already. I`m buying a silver crown (MAYBE I`m not to sure yet, it all depends on what I`m doing with my hair), I want to wear that than put my hair up in the back. I don`t know if it will work because of the length of my hair, but I will but the addy below.

The two I like is the one in the middle of the first row (with the crown) and the one in the middle of the bottom row!
If you have short hair or an idea tell me!
I`m usually good with finding styles for myself, but because its prom I`m like "OH MY GOD!" *L*
thanx for your help

Princess!

I bought a teira.(??SPELLING??)
the gems (dimonds) go all the way around it! Its about an inch thick! I hope this helps you out, with ideas!!!