I think your face looks great, and I suggest you leave everything alone. If there is an issue in regards to vertical height, it is more the height of your maxilla that is slightly off rather than the mandible. Having a good size mandible with good vertical height, will prevent you and protect you from never developing a double chin, marionette, lines, or premature gels. Of all the issues to have this is a good one because it will keep your good Feminine looks over a lifetime while others show signs of premature aging far earlier than you will. Your facial bone structure is actually very good and is in my opinion in your favor. Take a look at how individuals with a small mandible tend to age with the formation of early jowls, loss of jawline, definition, and the formation of a double chin to understand why your face has the upper edge. Be happy with what you have. Avoid surgical intervention unless indicated. Best, Mats Hagstrom, MD.