Based from the photo, I believe your upper teeth is reasonably seen when you smile. If you want more to show however, a conservative upper lip lift will be the answer.
A lip lift can will shorten the area between the nose and upper lip, which should increase the incisor show. Consult with a Board Certified Plastic Surgeon for an exam, and to discuss you options and expectations. Best wishes!
If you are dissatisfied with the amount of incisor show, you
would benefit from a lip lift. A lip
lift will shorten the distance between the nose and the upper lip, rolls out
the upper lip and increases your incisor show.
The recommended amount of incisor show is 2 millimeters at reprose (jaw
Gary Horndeski, M.D.
A low smile line can be improved by several forms of lip lifting, either a subnasal lip lift or a vermilion advancement. But in a male these procedures have to be considered carefully.