If I get bigger implants than what I have now (397cc) will my nipples end up hanging lower? (photo)

What you have now is a little large for your frame and causing your implants to sit somewhat high. Going larger will make this worse. The pockets could be lowered, but I suggest keeping this size. You may also have more rippling with larger implants as your tissue will be stretched and thinned even more.

Dear Cheerful616835,
breast revision surgery is the most difficult plastic surgery procedure performed. Botched breast surgery alters normal tissue planes and laxity, the ability of breasts to heal properly, and leaves scar tissue that dramatically affects the level of difficulty of the corrective surgery.Many patients come in to correct poor outcomes from their initial surgeries. The most common problems are due to implant malposition, bottoming out of the implant, poor scarring, and incorrect implant size.While the type of revision required will depend on the result of the previous surgery and the desired result of the patient, some revisions involve extensive pocket repair that may or may not need specialized external bras.If you are considering breast surgery revision, you should speak with a board certified plastic surgeon and have yourself properly assessed. Only after a thorough examination you will get more information and recommendations. Also, you have to make sure that your surgeon understands your breast augmentation goals.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

If you went with a substantially fuller implant it might make the nipples look lower but they actually won't have moved any. Might not be an issue though so you can always do the implants and wait to see. I would recommend a periareolar lift if you want them higher, NOT lowering the crease to make them look more cenetered. If you lower the nice crease you have you open up the possibility of bottoming out and double bubble deformity so I would not go there.