A number of years ago, a friend and I were brainstorming about the following idea that I still has merit.
Often caricature artists at fairs on the street display pictures of celebrities as proof of their artistic ability. When you pay them to draw a picture of you, they draw a caricature of your head on a tiny body doing some activity you tell them you like.
I want to learn how to draw a single celebrity: Snoop Doggy Dogg for example. Then, I would set up shop on the street as caricature artist and advertise my work with 1-2 well-drawn pictures of Snoop. Every time someone asked me to produce a caricature of them doing a given activity, I would draw a picture of Snoop Doggy Dogg, with something roughly approximating the customer’s hair, engaged in the activity of the customer’s choice. If people objected, I would insist that, "that is just how I draw people — I thought it was clear from the example."