Finishing The Alechemist

I wonder about the drawings in The Alchemist. Most novels for adults don't have drawings. They're more common in children's book or some YA books. I wonder: Does this mean The Alchemist is a children's book? It is pretty straight-forward and easy to read. But I wonder if the drawings serve to remove ambiguity. It's pretty easy to know what the book is about. It's hard to mistake the main idea, that everyone has a Personal Legend, that they're hard to achieve, that the journey is as important as the result, etc. Should a novel be this straight-forward? Shouldn't its readers have to try a little harder to get it? Another, related, question: Would you be likely to reread this book?