Will 295cc under help me achieve a D cup? (Photo)

It is very difficult to specifically have an implant alone correspond to a cup size.  Bras and implants are measured differently.  Your surgeon should guide you towards your desired shape.  You will not be able to know based on a specific volume of implant, in addition the surgeon would also know the differences above or below the muscle.  If you  try a sizer and a bra with a black cami (looks smaller) and white cami (looks larger), this can give you an idea of the shape and this is really what is important ultimately, not a specific number of cc's.

You might want to steer away from cup size as implants do not come in cup sizes plus as you know, bras all fit differently. I'd re visit your surgeon and re size to confirm your choice. High profile will give more fullness than moderate plus, that is their intent. I don't know that you will be any more full by placing the implant above the muscle. Not sure that is a true advantage of an above the muscle placement.

Thank you for the question and picture. Unfortunately, online consultants will not be able to provide you with specific enough advice to be truly helpful.   Generally speaking, the best online advice I can give to ladies who are considering breast augmentation surgery (regarding breast implant size/profile selection) is:
1. Concentrate on choosing your plastic surgeon carefully.  Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals  with your plastic surgeon. This communication will be critical in determining  breast implant size/type/profile will most likely help achieve your goals. 
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as  “natural” or "D cup" etc means different things to different people and therefore prove unhelpful.
 Also, as you know, cup size varies depending on him who makes the bra; therefore, discussing desired cup  size may also be inaccurate.
 The use of computer imaging technology may also be very helpful during this communication process.

3.  Once you feel you have communicated your goals clearly,   allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals.  Again, in my practice, this decision is usually made during surgery (after the use of temporary sizers assessed with you in the upright position).
I hope this, and the attached link, helps.