I am not sure what to think of these pictures, it triviliases the entire subject and makes it look child like, no engineer worth his salt will be seen with these doodles on his desk. Stop reading as soon I saw that
Many doctors will tell you how useful some colouring-in books were to them.
Here's one example, but there are others: https://www.amazon.co.uk/Human-Brain-Coloring-Book-Concepts/...
Richard Feynman said that if you wanted to quickly learn a subject you'd start with the books for children to get a quick overview.
I like the drawings. Cute, positive and informative.
Superficial way to judge the content, too.