When I began the research for my first book I planned to hire an artist to do the illustrations. I quickly realized that I was probably the only person crazy enough to undertake such a huge task and any professional illustrator worth their salt would cost me a fortune. I decided to bite the bullet and go at it on my own. It took me 9 months to finish almost 3000 drawings.
Step #1 - Rough pencil sketch
Step #2 - Black and White Line Drawing
Step #3 - Full Color Rendering
It sounds easier than it is - there are actually more like 8 steps. One of the most difficult tasks is deciding on the color scheme for each design. By the time you have done about 200 or 300 color renderings you have seriously run out of new color options! I bought every set of colored pencils available on the market today (about 875 pencils) and I still ran out of colors pretty quickly.