Would fillers to define or masseter slimming be better for my long/flat face and large jaw? (Photos)

This will depend on your desired results. Botox can be used to slim the masseter. Results will resolve in 3-4 months. I recommend getting a formal evaluation with a cosmetic dermatologist. Best, Dr. Emer

Dear 3iea0m9A2l1,
Thank you for your question. It is difficult to make an accurate assessment and recommendations based on photographs alone. I recommend you discuss your concerns with your injecting provider who can perform a thorough examination and recommend the best treatment options to address your goals. Filler to the cheeks may help boost that area and help make the lower face appear narrower/more tapered. If that is not beneficial enough, you could consider neurotoxin to the masseters to help narrow the lower face. 

Hi,Based on the photos you provided, you have a recessed chin. A chin augmentation will be the most beneficial procedure to add balance to your facial features. This can be done both surgically and non-surgically. In my practice, we take 3D photos and can use computer morphing to preview what you can expect to look like after the augmentation. While you mentioned non-surgical only, if you pursue corrective surgery a permanent chin implant will be the best long-term solution. Best,