McCann is one of the best there is in traditional media, specificly watercolor. He just paints. Typically, he makes his clients get the perspectives set up for him, and he just shows up and paints like a madman. I have heard that he requires first-class travel and accomodations and commands a daily rate that I would normally get for a week of work (or more)--and no paid hotel and meals. But when you look at his work you will see why many of my clients are sometimes happy to pay way more than I or most renderers would charge to have him do renderings.