What are the hidden pictures?

Two kinds of page:

• Mystery mosaics: a shape drawn by the studio (heart, butterfly, fish, owl, cat, bird, turtle, elephant, egg, leaf, drop, moon, star, flower, apple, pumpkin, balloon, Christmas tree, house, teapot, cupcake or mug), each in its own color with its eyes, on a scene: sky and grass with a sun, a sunset, the sea, pink and lavender, or a night sky for the moon and the star. The scene and the pose change page by page, so the same shape twice still makes two different pages. Free, no AI.
• Mystery pictures by AI: anything you describe, drawn by your image engine as a flat-color illustration (big simple shapes, few colors, no outlines), then hidden in the cells. One picture on your key per page.