How would I achieve hollow cheeks? My cheeks seem rather full, I'm 140 5'11''

Based on your photos, it appears you would be a very good candidate for buccal fat pad removal. This surgical procedure can be performed using local anesthesia and an incision inside the mouth to eliminate any visible scarring afterward. The small fat pad is removed via the incision to create instant facial slimming in the mid and lower face. Recovery after buccal fat pad removal is no more than a week for most patients. Make sure you work with an experienced, board-certified facial plastic surgeon to ensure an optimal outcome.

The buccal fat pads are encapsulated compartments of fat below the cheeks. They generally do not change with weight gain or weight loss. I would start with buccal fat reduction to provide a slimmer appearance. The surgery can be performed with local anesthesia and patients are well recovered at one week.

most of my younger guys do buccal fat pad reduction, facetite/liposuction of the neck, and fillers to chin/cheeks/jawline/temples,  to give them a more chiseled face.  see my IG and links. at home dermarolling should be started to Improve texturea nd tone and tighthing along jawline (see link to emeragecosmetics.com where we have a recommended daily skincare and weekly MTS + anteageMD dermarolling protocol).
For facial slimming a combination of treatments are always needed.  Options include:
1. Buccal fat pad removal to reduce fat on the lower face
2. Factite or Renuvion/J Plasma to tighten the lower face, jawline, and chin to reduce fat and give the jawline and neck tightening and shaping.
3. Botox to the masseter to reduce the muscular size of the jaw giving the face an illusion of being more slender
4. Fillers to the jawline, chin, cheeks, temples and brow help to shape the face and make it more angled and defined
  Best, Dr. Emer.