Thank you very much for your response. I'll be sure to look into Project
Zero. As a matter of fact, my boss gave me a book called "Artfull Scribbles"
written by Howard Gardner. It's all about children's drawings and the way
they develop, as well as some ideas of what they could mean. It's very
interesting, especially for anyone who regularly works with children, as you
can compare what he says with what you see. Thanks again!