There are surgical and non-surgical approaches to lip augmentation. Non-surgical approaches include botox (slight lift, reducing gum show) and filler (volume restoration). Surgically, you can have two separate incisions under the nose (italian), one incision under the nose (bull horn), one incision at the red/white upper lip junction (gull wing) or two separate incision at the corners, or a combination, depending on your desired look and anatomy. From the single photo it is difficult to throughly advise you. If you primarily want the lips more defined, I would focus on that first. You can also have them done at the same time, that is always an option, and safe in most hands. Consult with an experienced lip surgeon for a complete range of options that are appropriate for your situation.