I am not a professional artist. Let's just get that out of the way. I started out ambitiously, winning a regional art contest when I was five, with a crayon and watercolor painting of a leopard. My late grandfather was a talented artist and art instructor, and I will never forget how proud he was the day I won that contest. As I grew up, I sketched constantly, but since my grandfather died when I was ten, I lacked instruction. It wasn't until I was in my early 20s, when my mother-in-law gave me a Reader's Digest book of drawing and painting, that I finally figured out how to give my sketches a three-dimensional appearance, simply by adding...