I'm 5'6 and 110 lbs. Would a BBL give me more of an hourglass figure, or would implants be better? (photos)

Hello Peaceful4771, 
It's a pleasure to answer your questions! Buttocks augmentation with implants procedure is associated with a high post-operative complication rate (up to 40%). Patients who get buttock implants can experience pain and infection, and have trouble sitting on their buttocks for a long period of time. Moreover, implant patients are likely to develop seromas (lumps caused by an accumulation of serum within the tissue) and experience dehiscence and capsular contracture. Therefore, I would suggest you getting a Vaser Liposuction with fat transfer to the buttocks (Brazilian Butt Lift (BBL) instead to achieve a fuller, beautifully rounded backside. Since BBL utilizes autologous fat, the chance of allergic reactions to foreign substances, such as dermal fillers and silicone prosthesis (implants) are significantly reduced, and the results are longer lasting and more natural-looking. Recovery is also better with buttocks augmentation with fat grafting. BBL’s patients can typically return to work one week after surgery, as opposed to those who receive buttock implants and would need at least two weeks to resume their regular activities. One of the main considerations when evaluating a patient's candidacy for BBL surgery is whether they have enough fat cells to use during the fat transfer phase. For patients with insufficient fat deposits, the plastic surgeon may advice weight gain before the BBL to qualify for the procedure and achieve a more voluptuous buttock. I would recommend asking your plastic surgeon if he/she requires you to gain weight or not depending on whether he/she is planning to do a full body Liposuction or just a limited Liposuction to harvest the fat. Best wishes! Dr. De La Cruz. 

Thanks for the question. 
In this regard, I recommend you waist and back Liposculpture, getting better curves especially in the waist, improving your body contour.
Finally, I suggested take the fat we get and transfer to the buttocks and hips, to mold them and get better volume, contour and butt projection, is that we know as "Brazilian Butt Lift" (BBL).

Hello, thank you for your question. It seems like you can benefit from a BBL, I have had great success with BBLs for thinner women, but these surgeries are not easy. Maximal fat must be harvested without creating any contour deformities. If the waist was smaller at one time, the waist can likely be reduced with liposuction to those same measurements or smaller provided the muscular and facial integrity has remained the same. 
Certain aspects of the buttocks or hips may not be improved as much if the tissues do not allow for much stretch or cannot accommodate the fat that is transferred.  In these cases, the final result will be limited by the skin envelope.  This is an issue that cannot be completely controlled by the surgeon.  Finally, the ability of some patients to heal and retain more of the fat than another patient accounts for differences in shape and result following BBL. Schedule an email or  Skype consultation with a board certified plastic surgeon who specializes in thin patients.