The number of coloring books you may have, and how many pictures can be in each, is limited by your licence agreement. Please check your agreement for details.
From a software point of view there is almost no limit to the number of pictures you can have. You can group pictures into coloring books. Those coloring books can also be grouped into sets, and even the sets can be grouped into a tree like structure (similar to a directory structure).
For ease of navigation we recommend that each coloring book not have more than 30 pages.
