Tummy tuck and body contouring
Based on the photos you have submitted above, it appears that you would benefit from a tummy tuck procedure to improve your abdominal contour. The best time to undergo surch a surgery is when you are close to your ideal body weight. As you lose weight before surgery, the skin will sag slightly more that it does now, however, this will be removed at the time of surgery.
Also, based on the photos of your back/buttock area, you may also consider liposuction of your lower back and sides with a...