Hi, I have performed many facial shaping procedures, over the past 30 years, using dermal fillers, facial implants (cheek implants, chin implants), liposuction and/or facelifts. Despite its current popularity, fat injections (fat transfer) is far less reliable than dermal fillers or facial implants at providing a predictable volume to contour features of the face (cheek, chin and jaw line) and for that reason I don't use fat to shape the face.
Following the beauty principles outlined in my book on face and body beauty, women look the most feminine, youthful and attractive with heart shaped faces. Heart shaped faces have cheeks that are full and round in the front. Cheek augmentation with a dermal filler or using cheek implants for a permanent enhancement will create full, round cheeks that will feminize the entire face.
Think of facial beauty as something that "must" address all layers of the face including the skeletal structure of the cheeks and chin, the overlying SMAS muscle, amount and position of subcutaneous fat and finally the degree of skin laxity. It's an "urban myth" that pulling tissues over flat cheeks and a weak chin can create a beautiful or handsome face. Similarly, dermal fillers or facial implants alone can't lift and remove excess skin from the face and neck. Natural looking beauty is created by the aesthetic vision of what tissue layers need to be adjusted by what technique and amount.
The cheeks should be aesthetically shaped before shaping the "tear trough" area in my humble opinion. It should be noted that the skin in the tear trough area is extremely thin which makes placement of a thick dermal filler or fat injections prone to lumps, bumps and irregularities. Once placed, fat is difficult to smoothen out or remove in the tear trough area as the lower eyelid muscle can be damaged by attempts to remove the fat and/or surrounding fat dissolved if steroid is injected in an attempt to dissolve the transferred fat. Often the "best" treatment is time in my humble opinion as some of the fat will most likely dissolve over time.
Hope this helps.