And if so can they be too big?
I think she would look alot better if they were smaller.
Most of the time NO very few breast jobs look good , not all women can pull them off , a lot of them are asymmetrical ( I know natural breasts are as well but implants more so ) most in fact go to small and are happy right after the surgery until the swelling goes down and then they're looking to go up another cup size
A very good breast job will having you second guessing but those are few and far in between