I developed this sketch on paper with a Sharpie. I was about to translate it into digital art by scanning it and use it as a template to draw the final piece with the pen tool. I decided to scan it at 600dpi and auto traced it instead (something I have been doing since Illustrator incorporated auto trace into the program in 1527 A.D.) I comped it up into a poster, gave it a catchy tagline and here is the result. It was a just for fun project.
Same here. This was a commercial project I recently finished. First a detailed pencil sketch. Then a cleaned up sketch. I drew the final with a sharpie and then followed the same process as above.