Take a breath. The photos provided suggest little more than time-related volume loss, particularly in the mid-cheek region that is more prominent in an otherwise thin, normal weight individual. A robust filler, such as Voluma XC, placed appropriately in the cheeks would likely immediately remedy the mid-cheek hollowing and would likely secondarily improve to some degree the drooping at the corners of the mouth. If necessary, Restylane Lyft, can be injected around the angles of the mouth to further lift and straighten the corners. It can be used, as well, to elevate the cleft below the lower lip and diminish the shadowing there and add a very youthful, sensual pout to the center of the lower lip. Finally, if necessary (difficult to say from the photos), additional filler can be used to straighten and define the jawline. I stopped using threads years ago; they are associated with many adverse reactions, are difficult to remove once placed, and at best only pull the skin (which can cause an unnatural skeletal look, particularly in thin women). Likewise, I gave up fat injections. They have the allure of being natural and permanent, but the reality can be quite different. Besides requiring a two-step minimally invasive procedure to remove the fat from the belly, hips, or thighs and then transfer to the face with larger bore cannulas, once separated from its original blood supply, much of the injected fat does not survive and so the promise of "permanent" is seldom realized. Furthermore, fat taken from the belly, for example, retains the characteristics of the region from which it is withdrawn--meaning that when the belly develops a midriff bulge, the fat in the face can do so, as well. In experiencjed hands, all of the above filler treatments can be completed in about a half hour with results that typically engender an immediate "Wow!" reaction. So, don't fret and make sure to consult with a board certified cosmetic dermatologist and ask to see his/her personal before and after photos before agreeing to proceed. Best of luck.