Here's one of the many images I am currently churning out for a series of educational books. As I've mentioned before my chosen software these days is Adobe Illustrator. I love the restrictions it places on me and with all art if you can wrestle with the restrictions and use them as a form of creative stimuli you find yourself really having fun with your work.
And bottom line is that you need to have fun to have any chance of coming up with worthwhile solutions to a client's brief.
So here's the image in each of it's layers.
All five of them...