Dave Willardson and Charles White III were friends and illustrators who teamed up at one time. They both played a big part in the revival of the airbrush for use in illustrations during the '70's. If you 're old enough, you may have had an album or two featuring their cover art. In 1980 they did 4 illustrations including the cover for the Harley brochure. Dave later went to work for Disney doing all the movie posters for their animated movies. He may still work for Disney.
The above art by Dave Willardson, one of the cooler illustrations from the 1980 H-D Brochure. These were the good old days. It's tough being an illustrator now. Today, almost nobody uses illustrations for music CD's, movie posters, print ads or brochures.