How to get rounder cheeks: I have very high cheekbones, and to my dismay - very sunken cheeks.

Volume and contouring of the cheeks can be created with well-placed fillers (Voluma, Radiesse, Bellafill, Contour) and Sculptra. Implants or fat are alternatives. Botox and radiofrequency can help slim and contour the jawline. Liposuction can help slim the face. Ultherapy, J Plasma and rf treatments can provide skin tightening and lift. I recommend getting a formal evaluation with a facial sculpting expert. Best, Dr. Emer

Hello, Thank you for your question. It sounds like you would be a good candidate for fillers. Without pictures it is difficult to make an exact recommendation but Voluma and Sculptra tend to be popular in the cheeks. Make sure that you consult with a local physician to make sure that you determine the best course of action. Good luck! 

Both implants and fillers in the cheeks can create good results for patients.  Both can build up the cheeks and help bring proportion to the face.  You must balance the pros and cons of each procedure and do what you feel is the best decision for you.
Fillers:
Pros:
No downtime
Reversible
Quick
Cons:
Temporary
More expensive in long run
Implants
Pros:
Permanent
Great for patients with poor bone structure
Less expensive overtime
Negative:
Risks associated with surgery
Possible infection
DowntimeI hope this helps!