Fat transfer is a wonderful way to add volume to your face provided that you have sufficient amounts of body fat for harvesting.
In addition to fat grafting, there are also some temporary voluminzing options you might want to consider. One of my favorites is Sculptra. This is a wonderful product that gradually adds diffuse volume to the face. It works really well for the cheeks, submalar (area below the cheeks), and temporal regions. Typically we perform a series of 3 injections and space the injections out 4-6 weeks apart. Once adequate volumization has been achieved, we recommend a maintenance injection every 6 months.