They want to help you "improve" your drawing. Make it more realistic, more successful.
Which, by the way, I think is just a fine thing to do. If you want to do that, I recommend "Drawing on the Right Side of the Brain." It's great.
But, I want to tell you: You don't have to be "good" at drawing for drawing to be good for you.
Did you know that even in remote areas of the world, where there isn't a lot of paper, kids will take up a stick and draw in the dirt? The urge to make marks is very strong.
I believe that if every school kid and grownup got 30 minutes of free drawing time per day, this would be a miraculously wonderful thing.
It would create a space where you can just move a pencil around, let your brain loose, hang out with a piece of paper, and take up your own side of the conversation you're having with the world.
You might scribble, or you might make a face, or you might just sit there and stare at the paper.
Maybe you would make rubbings of the coins and paper clips in your desk.
Drawing, making marks, puts your mind in a different place. It's a place that you make, where you get to travel around. It's not full of text messages and emails. It's a really really neat place, and I'd love to take everyone to visit.
So with that, I'll leave you with "Ten Great Uses for a Pencil."