How much of the skin on upper lip I can remove for a natural look? (photos)

With your philtrum length being about 22mm, I would estimate that the ideal amount of skin to remove during a surgical lip lift for you would be about 6-8mm. This would give you a subtle yet noticeable change without looking overly "done" or exposing too much of your teeth. You certainly seem like you would be excellent candidate for this procedure based on the photos. Best of luck. 
Gary Linkov, MD
Lip Lift Specialist
Manhattan

The picture with your mouth open is the only one that matters and it shows adequate teeth visibility. Therefore you can only remove 4-5 mm of your upper lip to avoid too much teeth visibility. Even though you might still be more that 15 mm, in your situation because of the low position of your teeth, it would be appropriate..

You stated that from the bottom center of your nose to the center of your upper lip is 22 mm.  A normal range is from 12 to 15 mm depending on age and facial geometry.  However, if just the center was removed you would end up with the bunny look, which is unacceptable.  You will need your corners elevated since they are downturned and I recommend an extended lip lift.  This will shorten the distance between your nose and upper lip, increase mucosa of upper lip, increase incisor show and pull up the corners.  I usually take out about 6 mm centrally and 10 mm laterally at most.  Best Wishes,Gary Horndeski, M.D.