Weak jaw, is genioplasty the answer? (Photo)

You could do a chin implant, but if you look at the projection of your chin (how far forward) it is pretty good. A genioplasty would bring the most prominent point of your chin (called your pogonion) down further to be in line with your jawline. Your simulation that you do does exactly that, the main increase is in the vertical dimension, and as you notice in the simulation, your jawline goes from curving up to a straight shot from the angle to the chin. You would probably benefit from some submental lipo given that you don't need more projection. Your lower lip support and the balance of your lower facial 1/3 would be significantly improved. Doing an implant is an option, but in my experience, the you would be over-projected by putting in an implant, and your chin would look too rounded, especially in profile. Jaw surgery would only be beneficial if you had a lot of space from top to bottom teeth (overjet), which while I can't see on the pics, it doesn't look like you have to warrant jaw surgery.