Why is my left breast not dropping? (Photo)

You appear to have a difference in the height of the nipples as well as a difference in the height if the implants.Even a perfect positioning of the implants won't correct a difference in nipple height.Many patients want to avoid breast lift incisions at any cost, and sometimes end up with differences in nipple height that a different lift technique would correct.The around-the-areolar lifts are weaker than anchor type lifts.  Often, changing the lift type when the revision is done helps a great deal.While very large implants are to an extent a stylistic choice, they do tend to create problems over time, so when the revision is done is a good time to see if there is a better sized implant that would achieve your goals

Yes, you have breast asymmetry and it is always nice to see what they looked like before they were operated on.  Good luck with your potential future surgery.