Thanks Blowhard. Another small step as of last night. I laid the drawing of the bike on my lightbox, and then another sheet over that. On the top sheet I drew the driver so he fit directly over the bike. That allows me to have the bike with and without the driver, and no messing up my previous art.
So in Photoshop here is the scan of the driver, cut out and super imposed on the bike. I did some work to make his helmet clip behind the windshield, which of course the paper doesn't do.
I'm debating from here where I want to go with this.
