You can start with the first backdrop before you go on to the ship. It will have a border saying the ship and date.
They have a lot of backdrops set up at dinner times. Some more formal , pirate night ones, if you watch the app they do Magic photos too that will add the characters in the picture when you look at them.
The photographers are with the characters as well , the handlers not the photographer will take a picture with your phone if you want to be in them. You can take them of your kids, just let the photographer take his first.
The photographers also come in the dinning rooms on Formal, semi formal and Pirate night.
Definitely no shortage of photo opportunities. I have a lot of scrap books of pictures when the kids were small.