Will the 700cc look too big on me? (Photos)

Patients often think in terms of cup size when considering augmentation. Unfortunately, devices are sized in terms of milliliters (cc) of volume. This can lead to some confusion when sizing. Additionally, it is important to remember that cup size itself is not standardized with variations from one manufacturer to another. Unfortunately, as many women can attest their cup size in an industry leader such as VS is not necessarily transferable to another brand.
Another point which is often under appreciated is that of anatomy and starting point. Any implant will add volume to the volume which is already present. The implant is additive. A particular volume will not necessarily confer the same cup size to different patients (often times it will not even confer the same cup size to different breasts in the same individual...remember they are "sisters" not "twins"). 
A general rule of thumb is that 125cc can represent somewhere between 1/2 to a full cup size increase. Smaller volume differentials (25-50cc) are typically less consequential representing a volume change of less than a shot glass. However, I have found these numbers, at least anecdotally, to be of little help. Patients often present with notions/goals which do not correlate with these sorts of sterile volumetric assessments.
When sizing patients, there are a number of useful tools including:
-3D imaging (has the added benefit of offering a volumetric analysis of the pre-operative breast)
-Breast sizers (rice bags)
-Goal photos
I also recommend that patients commit to a particular look rather than a cup size. Once a patient settles on a look that pleases them the overall cup size increase becomes less relevant.The key to obtaining a natural result is to stay within the parameters defined by your BWD. 
700 cc is a huge implant irrespective of frame. 50 cc is unlikely to make a significant difference in outcome (slightly more than a shot glass). However, it is important to remember that complications rise with volume. The greater the implant volume...the greater the weight...the quicker the sagging.
As always, discuss your concerns with a board certified plastic surgeon (ABPS).

700 cc implants weight over 1 ½ lbs each and will most likely cause neck, shoulder and back pain.  There are 2 parts to augmentation: one is cosmetic and the other is functional.  Large implants make the breasts look better but functionally they may not be practical for you.  Implants are not lifetime devices and half are removed by 9.5 years.  I strongly recommend you consider smaller size implants or combined with fat transfers.Best Wishes,Gary Horndeski, M.D.