What are the expectations for breast enlargements?

Most women have some degree of asymmetry between breasts and
breast augmentation may occasionally exaggerate this difference. A
breast that has an underlying implant will not necessarily feel like a normal breast, and some women may be acutely aware of the implant as a foreign
body within the breast. There is usually a difference in skin and nipple sensation following breast augmentation. The size and shape of the breast following breast augmentation surgery will adjust with time and is to some extent unpredictable.

It is also not always possible to create a 'cleavage' with breast augmentation. The weight of the implant may influence the age-related changes that normally take place in breasts. Movement of fluid which fills the implant may occasionally be seen through the skin, this being more likely in the saline (salt water) filled implants, and less likely in the more viscous silicone implants, which also have a more natural feel.