Will my implants look natural even if I have no breast tissue?

Thank you for the question.
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. Sometimes, it is necessary to see a few plastic surgeons before you find one who can demonstrate significant experience achieving the types of outcomes you will be pleased with.
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 "C 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.  Again, the use of computer imaging has been very helpful during the communication process, in our practice.
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 intraoperative sizers.
I hope this (and the attached link, dedicated to breast  augmentation surgery concerns) helps. Best wishes. 

Since you have little of your own tissue, your final result will look like the implant.  Proper choice of implant with correct positioning is critical.  You should see examples of your surgeon's work that closely matches you pre-op anatomy with your  post-op expectations.   

It's a good question. An in person consultation will help you receive the most helpful answers, but in general patients with less breast tissue do well with properly selected implants. During your visit your surgeon will listen to your goals and help you select an implant to help you obtain those goals. The main thing to be mindful of is that any sized implant will show more on your chest, then someone who has more breast tissue. If your goal is to maintain a natural look, then you will likely end up selecting a slightly smaller implant than you would if you had larger amounts of breast tissue. Regardless, you should have a very nice result.