Hello! I own this piece of framed art work that appears to be the actual design of one of James Marshall's book. I really have no knowledge about this and I was hoping someone might have some information. For example, how it would be used in the publication process of the book or if it was used for that. The main piece is a signed drawing by Marshall for his children's book (back cover) George and Martha: Rise & Shine. I also have 4 overlays that appear to be transparencies and they do not photograph well. I am assuming the overlays would of been used during the making of the book ?? I would appreciate any information.