What can I do to improved my naturally tight, forced-looking smile so that my upper teeth show? (photos)

I am a 26 y/o white female, whose teeth didn't come in until I was 13 months old. Once they did, I had a severe overbite and buck teeth. I had braces from 3rd-6th grade, including head gear, Thorpse (sp?) Appliance, permanent lower retainer, temp. upper retainer to help correct my teeth. I now have beautiful teeth with a lesser overbite, but I'm increasingly unhappy with the appearance of my smile. What would you suggest to help bring my facial features into harmony? Thank you in advance!