5'9, 150lbs, not sure how to fix my midface? (Photo)

The limited photographs from the side profile demonstrate a recessive, chin and fat deposits in your neck. Placement of a small chin implant will augment your chin forward for better structural support for the soft tissues in your neck. If the fat in your neck is located above the platysma...

Yes you need to both remove excess skin via facelift and replace the volume since you loss them from your weight loss. Nowadays there are fat-like biologics from MTF you can use if you have no fat any where else. Sometime dermal fat augmentation might also helps by removing the excess skin...

It is very likely that cheek augmentation with implants would help to create more harmony in your midface;it is usually done from inside the mouth, so there are no visible outside scars. In person or teleconference consultation with a board certified plastic surgeon familiar with this procedure...