In order to have perfect mammaries you need to have perfect nipples and good breast contour, you cannot have one without the other, to create the perfect bust you need to have a well defined breast contour, plus the right size areolas with the perfect size nipples on each breast, once you have this, you have achieved mammary perfection.
When you are enhancing the mammaries you can target the enhancement of the breast contour and volume, the areolas and the nipples, which will allow you to improve the quality and self-worth of each breast, if one is slightly smaller then the other (right breast tends to be smaller on most females) you can match their size and make them more identical, since being symmetric is what yields beauty in the female form.