Photos and sculptures are purely optional aren't they, does this mean as long as the portrait was done before they aged up you are okay if the photo is rather close to the mark?
I loaded my game back up today forgetting it was gen three's adult birthday until the camera moved, for a second I thought he was dying and it scared the life out of me. Anyway I quickly sent his grandmother out to grab a photo, I took it before he aged and put it on the wall, it's the top of his head but it is a picture, he already had his portrait and sculpture just forgot the photo.
If it's a case of not being able to count it for the museum total I'm fine with that, I'd just hate it to be a fail because I forgot, I took it and placed it before he actually did the twirl to adulthood but I'm worried it was still too late as he had sparkles