Lip lift, how many mm to take off? (Photo)

I'm very unhappy with the length of my upper lip and the distance between my nose and upper lip. I'm not particularly unhappy about the shape of my lips although I think I could use a little bit more volume. How many millimeters of skin would you recommend removing? I want a short philtrum as I think it would improve the balance of my face and look more youthful, but not so much that my upper lip is deformed or rabbit like. Thanks!