Teeth don't show with mouth open? What's wrong? (Photo)

I've heard that a lip lift could benefit this problem however I've also heard that if your teeth don't show when your mouth is slightly ajar then that means a lip lift would give you the duck lip appearance. I've also had braces to deal with the problem and while it has gotten better it's still very similar to how it appeared before. My smile feels very forced and not a lot of my teeth show. Would veneers help, or would they look too much for my small mouth and teeth?