Will 475cc high profile look natural on me? (Photos)

Based on the photos, it looks like the high profile 475 cc implants will fit you well. Of course, I am assuming that based on your breast dimensions, the implants are not too wide for you. Good luck!

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.With regards to your particular question, 475 cc is a large implant. However, depending upon your measurements this may (or may not) be reasonable. Remember "natural" means staying within your unique dimensions and erring on the side of subtlety i.e. moderate + (your wish picture is not "natural" by these standards). The quickest way to achieve the dreaded "fake" look is to exceed these dimensions.
As always, discuss your concerns with a board certified plastic
surgeon (ABPS). 

The best way to pick the right breast implant size is with a combination of trying implant sizers on and 3-dimensional pre-op imaging.  This combo will make sure that the size you are looking at will give you the look that you want.  Good luck!