Would like to improve facial symmetry and jaw definition, would fillers work? (Photos)

Hello LLL,
Fortunately there are many ways to balance your lower face with the great treatments available today. I would begin with an in person examine and evaluation. I believe that non-surgical treatment can help you achieve your goals. Your photos appear to show an assymetry of your face, your right side appears smaller than your left side. Your chin is underprojected. I would likely focus on initially adding volume to your right side and chin. Feel free to contact my office 818 501-3223 to schedule a consultation at your convenience. Wishing you healthy and happy holidays, I look forward to the privilege of helping you achieve and maintain your facial aesthetic goals.
Michael Persky, MD

At least from the photos provided, it appears that the use of various HA fillers can be used to achieve greater harmony and proportionality between the projections of the chin, lips and nose. What's more, adding volume to the chin would have a secondary benefit of helping to better define and straighten the jawline. A robust HA volumizing filler can be used for a nonsurgical chin augmentation. Likewise, a medium viscosity HA filler can be used to achieve greater volume and projection in the lips.
For additional benefit, a robust HA lifting filler for the cheeks would not only help to create a more desirable Ogee curve, but create a smoother transition between the upper cheeks and the under-eyes.
All of the foregoing can be performed in one treatment session of about 45 minutes, which yields immediate result and typically engenders little to no significant downtime, or, if so desired can be performed in separate treatment sessions. You would be wise to consult with an experienced, board certified cosmetic dermatologist filler injector expert. Best of luck.

From the submitted photos it appears you are a good candidate for jawline sculpting. You can consider filler to add a bit more definition. Juvederm Volux is specially designed to address this area. Chin filler or an implant can also help to bring better facial harmony. Visit with a board certified plastic surgeon near you to learn more.