You have a reasonable perspective regarding the facial contours. The lower jaw appears 'deficient' in its forward growth resulting in an 'overbite'/overjet. The front of the lower jaw or chin area is also small. The ideal plan would be to combine orthodontics and surgery to correct both the bite and the profile balance; with a possible need for a sliding genioplasty as well.
If you want to avoid orthodontics, you 'could' mask the area with a combined sliding genioplasty along with gortex strips along the jawline to provide proper balance. Xrays are obviously needed to provide more information.
Hope this helps
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Implant or genioplasty
You don't need a huge movement, I would recommend a chin implant. Less expense, less surgery, less recovery and more reversible.
Joe Niamtu, III DMD
Cosmetic Facial Surgery