Thanks for submitting your pictures. The butt implants that are made of very soft silicone, are coming in different sizes and shapes. The implants manufacturer that I use makes them either round or oval. I do not like the round because it does not look natural. The oval implants are made round gradually in the back side or ' bubble butt' shape, where most of the silicone is concentrated in the bottom part of the oval implants. The bigger the implant, the more bubbly it looks. The most common implant , though, in my practice is oval round. With your displayed anatomy, you should have a very nice result. Consult with a board certified plastic surgeon who does lots of butt implants surgery. Check the before and after picture to make sure that you like the results.
Best of luck,