These implants do give you a more natural look in experienced hands. It also depends on your body conditions like weight, frame, breast tissue, and sagging.
Also, you should know that based on the material they are made, there are some differences.
The round breast implants are filled with a fluid gel or solution that flows freely and shifts its distribution into the implant depending on gravity and the position you are in.
So, when you are in the upright position, the fluid accumulates in the bottom, and when you lie down, the fluid distributes symmetrically, similar to a real breast.