I'm on the petite side and was wondering if 475cc or 495cc is too big for me? (Photo)

Good questions. Also, good job with the weight loss; achieving your long-term stable weight prior to proceeding with surgery is a great idea. Keep in mind, that breast lifting may be necessary to achieve an optimal outcome.Generally speaking, much of the final “look” achieved after breast augmentation surgery depends on several factors:

1. The initial shape, size (volume of breast tissue), symmetry of the patient's breasts. In general, the better the preoperative breast appearance the more likely the breast augmentation “look” will be optimal. 

2. The experience/skill level of the surgeon is important in determining the final outcome. For example, the accurate and gentle dissection of the breast implant pockets are critical in producing long-term well-placed breast implants. I personally think that these 2 factors are more important than any others, including type (saline or silicone) or model (low/moderate/high profile) of implant.

3. The type of implant used may determine the final outcome, especially if the patient does not have significant covering breast or adipose tissue. For example, some surgeons feel that silicone implants have a more natural look and feel than saline implants because silicone gel has a texture that is similar to breast tissue. Each patient differs in the amount of breast tissue that they have. If a patient has enough breast tissue to cover the implant, the final result will be similar when comparing saline implants versus silicone gel implants. If a patient has very low body fat and/or very little breast tissue, the silicone gel implants may provide a more "natural" result.

4. The size and model of breast implant used may make a significant difference in the final outcome. Therefore, it is very important to communicate your size goals with your surgeon. 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 or D cup” or "artificial looking" etc. means different things to different people and therefore prove unhelpful.
Also, as you know, cup size varies depending on who makes the bra; therefore, discussing desired cup size may also be inaccurate.
I use intraoperative sizers and place the patient in the upright position to evaluate breast size. Use of these sizers also allow me to select the breast implant profile (low, moderate, moderate plus, high-profile) that would most likely achieve the patient's goals. The patient's goal pictures are hanging on the wall, and allow for direct comparison.
I have found that this system is very helpful in improving the chances of achieving the patient's goals as consistently as possible. I hope this, and the attached link (dedicated to breast augmentation concerns), helps. Best wishes.

implant choice is based on breast shape and dimension.we can almost fit any implant to any patient. this isn't a good strategy to implant malposition ( too high or too low)in your case, the volume suggested will give better definition. the only thing, if the breast are saggy ( ptosis) the implants need to be low positioned. this will prevent the artificial look.a good bra support will help filling the upper breast.good luck