What Surgery Would Be Recommended to Enhance my Smile? (photo)

My mouth is very small and when I smile I show very little teeth, and in all honesty I just look funny and a little childish. What kinds of surgery would be recommended to make my smile sharper and wider? I also wish my bottom lip didn't cover my teeth as much. I love the shape of Emma Watson's smile, and if I could get anywhere near that I would love it!