How can I show more teeth? (Photo)

The photo you sent makes it hard to give you advice on how to show more teeth. The face may need to be evaluated smiling and not smiling as well as evaluating the length of your teeth and other cosmetic considerations. Consult with itch a cosmetic dentist for possible options

You can bring your upper teeth down with braces, but I really need to see a smiling pic to show where you are right now as well as xrays.  That pic looks like you're relaxing and not smiling.  You also need to be careful in that as you bring your smiling teeth down, the gum level comes down too.  So on the extreme end, you wouldn't want to create a gummy smile if you didn't have one before.