From an interview about his work, a description of his technique:
Your illustrations are very unique, combining bright colors with the appearance of a rough texture. Can you describe the process you use to create your art? How did you develop a personal style?
RC: I work on medium textured watercolor paper, cold press. I start with a golden wash overall. I pencil in the full drawing followed by layers of monochromatic values (usually sepias and browns) all in watercolor. I etch the paper. Then I use Prismacolor pencils and add the final multiple layers of full color to the piece. I complete the artwork with a layer of lithograph pencil (waxy black) to bring out the soft texture of the paper. Most of this technique came about through years of accidents and experimentation.
How did you create the crosshatching lines that overlay some of the illustrations, which add texture so nicely?
RC: The crosshatching lines are etched onto the paper using a scratchboard metallic instrument with multiple prongs, like a tiny comb.
Do you vary your style when you are working with different types of stories?
RC: Sometimes I’ve used pen and ink to illustrate some stories such as Mightier Than the Sword and How to Bake an American Pie. I used pure black Prismacolor and lithograph pencils to illustrate B/W pieces in the old New York Times Book Review.