650cc Max For My Body? (photo)

Samantha, you are trying to understand and make an educated decision.  This is very important.  You are on the right track.  

The answer is that 550-650 implants are probably not too big, but you must accept trade-offs (potential adverse consequences) resulting from this decision.  If the implants are too small and you are not happy, this is an adverse consequence as well.  By going larger, your skin (and nerves and soft tissue) are stretched more, become thinned out over time, and may or may not sag.  The models you show look sexy, but have obvious (un-natural) implanted appearance which works in some situations, but maybe not others.  Pregnancy and weight fluctuations change breast size, shape, and appearance.  The incidence of rippling and wrinkling, implant edge visibility, numb nipples, and other problems is higher with larger implants.  That being said, many many women are very happy with large implants, so you should go with your gut understanding it is impossible for you and for your surgeon to predict the future.    Your skin envelope will be tight initially, but expands to accommodate the implants during 6-12 months following augmentation.

Thanks for your question and pictures.  It is difficult to give accurate advice on size of implants without a good exam.  Measurements of your chest would need to be made to determine the size of implants that can be placed safely.  Also, placing such large implants can lead to significant issues in the future, so you should have a detailed discussion with a board-certified plastic surgeon before proceeding.