breast augmentation

Hey everyone. I'm really curious to know what under the muscle looks like compared to over the muscle implants. 
I'm looking at getting my boobs done in a few years hopefully. I'm just doing a lot of research now before I make all the decisions. If you could post advice or pictures if your okay with that.. it would be a big help. Also let me know which you had and what sizes ect... 
thank you :)