Thank you for your question and photos. I do not believe that buttock implants will give you the results you are looking for, like the "wish" photos. What they have in common is the sculpting of the waist, hips and abdomen which defines and enhances the buttocks. Your midsection is suboptimally sculpted, which certainly detracts from your result. As a secondary BBL, the surgery is more difficult and that is why I use the VASER technique to create the best sculpted look. You have enough fat to greatly improve your results and you do not need to gain weight. See a board certified plastic surgeon experienced in advanced body sculpting techniques for an in person consultation/evaluation . Good luck.
From your photos it looks like you have some excess fat in your flank/love handle region and some along the waistline. I would definitely consider revision lipo as this will help your overall shape. Any fat harvested can be added to your buttocks and hips. You have that indentation on your hip that can be filled in nicely.