You might like to look at some drawings in http://www.tiddles.co.uk/ a site for 'Badly drawn cats'.
Cats seem to be the most drawn animal, and the one most featured in comics, animation, and children's stories.
This is my effort. I can draw a bit better than this, but while showing children how to make faces using letters and numbers, I discovered that I could draw Henry's Cat (www.henryscat.com) using the letters from the word Miow. It then became my starting point for lessons.
Psychologists are very interested in children's drawings; teachers rarely are, but they could learn a lot if they had the training to do so.
One site that offers this is http://ericae.net/eac/eac0103.htm which outlines the
'Goodenough Harris Draw A Man' test.
There are a number of sites with such tests.
Another good one is http://www.architecture-mind.com/childrens%20drawings%20kellog.html
which shows children's pictures of houses.
There has been much concern about children's literacy. My generation (born 1930) had only reading as a hobby. Not even radio as the ones we had operated on accumulators which lasted a few hours at most, so it is not surprising my generation could read and write reasonably well.
But today children are brought up on visual images. They may not read much but they can operate machines that have icons instead of text, and this is fast becoming the preferred form of communicating, as we increasing communicate via machines rather than face-to-face.
I once suggested that perhaps written language is a passing phase, and one day we'll go back to communicating directly in pictures. Whether they are drawn by hand or machine is another matter.
More info: Children's Drawings