5ft tall, 140 lbs. , 36A or 38A current bra size. 450cc silicone: too big for me? (photo)

In my own practice we keep silicone gel
implants of all sizes available for patients to try on in a testing
bra. This is not a perfect teaching tool because under the muscle implants
tend to lose some projection, but because my patients look it actual implants
on their frame I find it the most helpful.I encourage my patients to bring a friend or
friends for a second or third opinion, and to bring a few different shirts.I suggest as you look at implants you think
about the relationship between the width of the breast and the width of the
shoulders and hips. Two wide will make you look top heavy, too narrow
will make the breasts look like torpedoes. I personally like to see the outer
curve the breast have balance with the curve of the hip.Once we hone in on the right diameter we then
look at the projection of the breast which changes the cup size. At the
correct diameter we can use a high moderate or low profile implant depending
upon the patients goals.Depending upon the starting situation, and the
degree of droop we adjust accordingly.Photographs of your goals are helpful, but
they don't always tell the whole story. They don't always let you know a
height and width of the entire patient.

are quite predictable in showing you the effect of the VOLUME on your overall appearances.  Though some doctors will minimize its effectiveness, it has not failed me in my 20 years of practice.  2 cups of rice in a knee high nylon stocking would produce a sizer of 480 cc's.  Use an unlined bra and see if this 'fits' on your body and simulates the photo you show.  It at least gives you a visual idea of what you will have.

That is a very personal decision. I think 450 cc could look very good. But over internet still hard to advise exactly.//