Previously AA/A cup and got 345CC implants. For a second surgery, what would be a ballpark CC range for this goal? (Photo)

Currently have 345CC Natrelle Soft Touch Gel Medium Profile. That was the max size implant that my surgeon felt she could comfortably place and said that a second surgery would be required to fit a larger size. I do prefer the large breast look and feel that my currently implants look too small/not proportional enough. To get my bodies version of the goal photo, do you have any recommendations on a CC range?