A little tracing paper or projection device accompanied by just the right photo or image (and of course all the right tools) and the eye for composition and simplicity and you have yourself an original Warhol drawing. It doesn't get much better than this.
Blotted Line Drawings: Warhol used blotted line to create his famous commercial illustrations from the 1950’s such as his 25 Cats Name Sam, A is for Alphabet, and I. Miller shoe illustrations.
If you have never heard of Jim Dine I'm certain you are familiar with some of his most more famous prints. I contend that his drawings are some of the best in the world. He is a living legend in art. Take time and research his work and life. You won't be disappointed you did.