My subject header pretty much says it all. I'd like to use images inside a coloring book, and might also like to use images inside children's books - both intended for resale. Will the standard license allow this? I understand that you're not supposed to sell a single image as a poster, t-shirt, or mug, but I'm looking at incorporating multiple images in a project which would have additional elements.
Anything where the image is the main element requires the Extended license. In your case the buyer of the book is buying the book because of the images so will need an extended license.