Do I need maxillary mandibular advancement? (photos)

This is a bit difficult without a complete skeletal analysis based on your ceph (x-ray) and physical exam.  From what I can see on your x-ray your maxilla and mandible appear fine.  I would not recommend maxillary and mandibular advancements in lieu of a genioplasty.  Please seek several consultations from board certified oral surgeons or plastic surgeons.

Clinical evaluation is needed. From what I see genioplasty should be fine. Again, I can not see your midface without evaluation. 

While a maxillomandibular advancement can be done in anyone the key question is the benefit versus the risks of the surgery. It is a big surgery with some risks if the goal is just a few millimeters of upper and lower jaw advancement in someone whose bite is otherwise normal. One would not normally do such  big surgery for a moderate aesthetic facial benefit. They are other simpler and less risky methods to achieve these aesthetic goals. 

Maxillomandibular advancement is not a small procedure.  I would have to evaluate you in person to make a recommendation but your radiograph does not reveal significant maxillary/mandibular deficiency.   Good luck. Donald R. Nunn MD, DDS  Atlanta Plastic Surgeon.