high profile, have a narrower base, but project more. usually used for small rib cages and small back sizes so that you dont get side boob from the back.
low profile have a larger base and are used for wider chested women. they dont project as much as high profile.
u can also get extra high, but they are quite rare and used on teeny weeny girls.
all can look natural it depends on ur frame hun, like if i had low profile they would look fake as they would be round and stick out at the side.
where as if a larger lady had high profile hers would look fake with two ball type shapes. its all down to the surgeon hun xx