Procreate is amazing. I bought it for my neurodivergent daughter and used it as a non-destructive coloring book.
I’d grab a line drawing of a character that she wanted to color from a google image search, add it to the background layer, lock the background so she can’t accidentally move or erase it, then have her color on the layer above it using the multiply so the black lines can’t be painted over. She got the point where she prefers to have the colorized version alongside the black and white so she can grab the colors from the original and do fun stuff like mimic its shading and copy paste in elements that might have been too difficult for her to render. Honestly, she barely speaks but on that program, she’s better than most adults already even at age 8. Her work looks utterly perfect and she knows a lot of advanced blending and cloning stuff that traditional media artists don’t usually know.