Thank you for your question.
It is difficult to accurately recommend an implant based soley on this particular picture. However, some things are evident and that is your skin is thin and you are quite petite. Therefore, a silicone implant is a good choice.
As far as the size and shape of implant, it will depend on the size of breast and appearance you are trying to achieve.
I like to approach breast augmentation from a dimensional approach. In other words selecting implants which fit your frame. This is determined by doing measurements of your breast and breast base diameter. A 400 cc moderate implant will be somewhat wider than the High Profile, less projection (and less upper pole fullness) and less size (volume). This may be too wide for your frame and give too much lateral fullness and still not be the size you want. A higher profile implant may fit your breast frame better due to it being a narrower implant. It will give you more projection, larger breast and more upper pole fullness (possibly a more "augmented" look.
Another consideration is an implant style in between these two implants (base diameter). This is a moderate plus implant. This will give you some fullness laterally (and cleavage) and increased projection, but not as much upper pole fullnes as a HP implant. It may look a little more natural in the upper pole vs a HP. This is where the "how you want your breast to look" question comes into play, ie..more or less natural. Remember as you go bigger, the more un-natural you may look.
Good luck with your surgery in June,
Best Wishes,
Dr. Brian Joseph