For your A4 Landscape Photo Book, you can select up to 196 pages. If you choose 24 pages, you'll have 24 sides to fill with pictures (12 sheets of paper). If you want to add more pages, we recommend selecting a multiple of four pages (24, 28, 32, etc.) because pages will be added per four sides. For example, if you choose to add only one page, three sides will remain blank or if you choose just two pages, two pages will be left blank. If you have any questions, please contact our customer service team!