The original works are now being shows at ArtInsights: Animation & Film Arts Gallery in Reston, Virginia, and you can check them out here, along with a brief interview with Chiarello where he talks about the Negro Leagues and how he came to paint the set.
I can look through 200 or more pictures and only one is just right. With my portraits, I try to let the viewer know who that person is, just by looking in their eyes. I think the Cool Papa Bell is the most successful at that...it's why i chose it for the cover. I know the moment i find the right picture for reference, and i'll keep looking as long as it takes...
Also, there is a link to buy Heroes of the Negro Leagues.