I'm not sure of the exact protocol with all of this but a couple of weeks before Christmas i renewed mine (still had a couple of weeks left so not exactly what you're asking). I was asked to update the photos as i had had them for 3 or 4 years now. I uploaded a new photo of myself and clicked next and prepared to upload a photo of the other person. It didn't ask for that and just used their previous photo. I'm not sure if there was another reason or if there are "bugs" within the system which may be causing issues with yours aswell.