Best Way to Get a More Defined Jaw Line?

Your photo shows an anterior hyoid position with mild microgenia and certicofacial liposis.  My recommendation would be to seek a consultation by a board certified maxillofacial surgeon who can evaluate and image you as well as perform radiographs to assess your condition.  He or she may suggest a sliding genioplasty to improve your jawline and chin projection as well as submental liposuction to further define the jawline.Best of Luck!

for best result you should consider two jaw (bimaxillary) corrective jaw surgery (orthognathic surgery)you have clearly repressive upper and lower face with poor upper lip support