But for working out color schemes, he often preferred to just paint pieces the old-fashioned way. On some things like my French MYTHWORLD cover, I did a sketch, then he painted a new version, then I'd refine the drawing based on the painting, then the final work would be done by me (in whatever medium I chose at the time).
On the cover below, I did the sketch, and Lon did a cover study in paint - and I was so impressed (especially with the dragon) that I didn't touch it. The composition was solid in the sketch - and all that I could do after would be to add linework (maybe) or reinterpret the colors in a different medium (say, color pencils, as I did the previous cover). But when my French publisher asked if I could have a cover ready IMMEDIATELY so we could debut the new MYTHWORLD book at a show in Belgium... I realized that we had the cover we needed all along. I adjusted it a bit in Pshop, and added some texture... but overall, I'd say Lon did us proud.
My cover pencils are below, and Lon's painting is under that.