What kind of surgery would best improve facial aesthetics? I often notice I have a long midface and big jaws? (photo)

Surgery for people with a long midface (often referred to as long-face syndrome) is optimally treated with jaw surgery (orthognathic surgery). This condition is typically associated with a gummy smile, an inability to close the lips without straining the chin muscles (a condition known as lip incompetence), and may be related to a small lower jaw.
It is difficult to fully diagnose your condition from the single photo that you have posted. This surgery is optimally performed by an expert surgeon with many years of experience with a practice limited exclusively to orthognathic surgery.