1.5 years post-op, what is happening with my revisioned breast? (Photos)

Dear Vixendeluxe,
I understand your concern. However, without a proper assessment, it would be difficult to determine what is wrong. It is best that you visit your plastic surgeon for further assessment or ask for a second opinion. Only after a thorough examination, you can get proper recommendations and advice.
Daniel Barrett, MDCertified, American Board of Plastic SurgeryMember, American Society of Plastic SurgeryMember, American Society of Aesthetic Plastic Surgery

With your first photos, your hair is covering your nipples, so I cannot say much about the position of the implant in relations to the muscle. The second photo does show the possibility of the implant falling down below the muscle. Please stand in front of the mirror, place your hands on your waist, and flex your chest muscles. This will show if both implants are behind the muscle. Please discuss your concerns with your surgeon.

This is fixable. The prior surgical revision enlarged the pocket allowing the implant to sit lower than it should. This can be remedied with another surgery that closes down the pocket along the inframammary fold so that the implant will sit a little higher on your chest. This will give you more symmetry in both your inframammary fold and nipple positions.