Anatomical (teardrop) vs round?

You have an ideal breast shape and size for a smooth round implant to give you adequate projection and a larger breast. The textured anatomic teardrop implants will not offer any advantage in you situation. The safest implants would be the Ideal Implant. These are saline implants with the proper profile and shape with an internal structure that will give you the feel of a gel implant, but without the need to do an MRI every 2 years to rule out a silent rupture. 

Gummy bear implants are a variant of silicone implants. The difference being a form stable gel fill which imparts the anatomic shape. Thus your question is more likely to be one of shaped vs. round silicone implants.
In my practice most patients will choose a smooth round device. When placed in the submuscular plane, the aesthetic differences are minimal. The downward pressure by the muscle across the upper pole of the round device forces it to assume a more tear drop appearance. Recent studies have shown that both patients and surgeons have difficulty distinguishing between the 2 implant types post-operatively. Additionally, shaped implants are more costly and have an increased risk of rotation.
Finally, although very rare, the few documented cases of BIA-ALCL (Breast Implant Associated Anaplastic Large Cell Lymphoma) have all been in cases of textured devices. Until more data is available many are shifting their practice back to smooth round devices.
Studies have shown most cannot tell the difference between the shaped and round devices when placed submuscular. In light of the added cost, most will opt for round devices.
The question of "natural" is less a question of implant type and more a question of appropriate sizing (staying within the boundaries as defined by the BWD).
As always, discuss your concerns with a board certified plastic surgeon (ABPS).

I rarely use tear drop implants (and yes they are also called anatomical or shaped) but in some cases they can be helpful From the presented pictures you might be a good candidate  for an "internal lift" - this way you may correct your borderline nipple position and avoid formal breast lift and associated visible scars

A very important question. A anatomic implant gives the most natural appearance of all the implants. Round implants such as a moderate plus silicone implant can also give very nice upper pole fullness without excessive roundness. One other option that is gives a very natural result along with a lift is fat grafting to the upper breast. Fat grafting as an option is more limited to more modest enhancement. I'd recommend an examination with a board certified plastic surgeon to discuss your goals, perform an examination and review photos.

Best wishes,

Dr. Jan

For the look you want the anatomic implant is best. The problem with those is the textured surface and the potential risk of ALCL. The risk is quite low, but most surgeons these days are reluctant to put is textured implants. Most of the confirmed cases of ALCL are associated with one manufacturer's implants which I personally do not use. Another nice choice for you would be a style 107 implant. These and many other choices are best discussed during an in person consultation.