Currently we can print a maximum of 300 pages per book. That's about 1200 pictures in total (and some extra text and other moments ?). If the density of your book is high you can always add more pictures later on. Once you reach the maximum of pages you'll get a warning that you should remove some of them.
Because of our binding process, each book has to have a minimum of at least 25 pages. If your book has less than 25 pages, we will add blank pages until the page count minimum has been reached. This is done to retain the binding's integrity and strength.