Based on your photos, if you are in good health, you appear to be a great candidate for lipo and a BBL. With a BBL, the goal is to transfer fat from areas where you find it displeasing to areas in which you would like more volume. You have to consider not only which areas will have perhaps the best fat, but also you have to consider which donor sites will have the fewest problems afterward with the liposuction. In general, the abdomen and thighs are preferred; but, if those sites are not available, fat from the sides, back, love handles, or other locations can be transferred to your buttocks and hips. If the waist was smaller at one time, the waist can likely be reduced to those same measurements or smaller provided the muscular and fascial integrity has remained the same.