750cc - I Want to Be Large

If your breast is larger to begin with you can get a larger implant. In general the larger the implant gets the more unstable the long term results are. Therefore a reputable plastic surgeon would try to protect you from your own desires if he or she thinks that a procedure is harmful to you.

From your photo is not clear that you need any breast augmentation. It is important not to place too large an implant as firstly it does not look natural & secondly it is unhealthy (can cause backpain, stretchmarks, increase the chances that future surgery will be needed etc.). The implants basically sit in position without any attachment to the chest wall itself unlike real breast tissue which is attached to the chest wall by ligaments. If you place a very large breast implant the constant pull of gravity on this larger heavier implant will eventually stretch out the skin, cause drooping etc. That is why these implants are associated with much higher reoperative rates than smaller lighter implants.