Do the books include photos or illustrations?

No — aside from the cover.

Every book gets a unique AI-generated cover illustration. The inside pages are text-only: no photos, inline illustrations, charts, or diagrams.

One caveat: the AI text may occasionally reference charts, diagrams, or images in its writing as if they were included, even though no images are ever added inside the book. This is a known limitation of AI-generated text. If your book says "see Figure 1" and there's no figure, that's what's happening, not a missing upload.