Can I achieve a full D cup without high profile implants? (photo)

None of the modalities to approximate final results from breast
implants are 100% accurate; they merely facilitate the patient and the
board certified PS concurring on the size and type of breast implant
which will come the closest to reaching the patient's goal. My patients
prefer to try on sizers under garments they typically wear to determine
if they fit as expected and help allay some of their trepidation
associated with this decision. When you consult in office with your PS,
ask to try on a profile bra with silicone HP 400 cc sizers under
a tailored blouse, tight sweater, swimsuit, workout clothes, tank tops,
and other garments you typically wear so that you have the best idea of
whether the garments fit as desired with the implant selected.  I would
recommend that you go with the size that boosts your self-esteem, and
fits your anatomy.
Choosing an implant based on an aesthetic goal that exceeds your anatomic capacity may lead to complications and possibly revision.   Remember that there is no standardization of cup sizes between sizes bra manufacturers.

Stop thinking in terms of bra sizes, they are irrelevant and not a useful means of determining breast implant size. Instead, have your surgeon size you in the office to see how you want to look in the mirror. Keep in mind that you are a set up for a problem if you choose an implant size that your tissues cannot accommodate, specifically dropout/double bubble. Although everyone talks about BWD, it is not the only or most important measurement. Nipple to fold distance under stretch is crucial to biodimensional analysis, having a big impact on maximum implant volume; exceeding that volume will lead to complications. As for natural versus fake, the bigger the implant you use, the faker you'll look; there's just no way around that. Similarly, the higher the profile implant, the faker the look.