From the photos, you look fairly lean overall, with some usable fat in the flanks/waist and lower abdomen. That can make you a candidate for liposuction with a modest, natural BBL, especially if your goal is more waist definition and a little more roundness rather than a very large increase in buttock size. The main limitation is donor fat. At 5'2 and 120 pounds, you may not have enough fat for a dramatic BBL, so the consultation should include an in-person pinch test of the abdomen, flanks, back, and thighs. If you are a candidate, much of the visible improvement may come from careful 360 liposuction and waist/flank shaping, with conservative fat transfer to the hips and buttocks. For safety, fat should be placed only in the subcutaneous layer, not into or below the gluteal muscle.