Why do some larger implants (550-600cc) look so small, and some small implants (250-300cc) look so large?

I'm 5'4" 160 lbs and scheduled for a tummy tuck, breast lift and implants. I have a small rib cage (32") and very small waist, with a large bottom. When I tried on different sizes of implants I ended up deciding on 390cc, but after looking at a million pics I'm worried I'm going too small. Any regrets not going with a bigger implant?





