Each layer was scanned into Photoshop and reassembled as a whole image for print. Of course, the files are sent CMYK for print, but are RGB in these images for the Internet.
Once the Photoshop images were created, my job was pretty much done. The art director corrected what she needed, created a detailed color match, layered in type, etc. If she needed anything during editing, she called me or emailed and made requests for additional pieces of art. The cover went through a similar process as the entire book. The files were then made ready to send to the printer. All-in-all, though it was not a simple process, the end product was beautiful! Keeping the paintings in layers allowed the art director to manipulate all aspects of the images in order to really bring out the best possible version of my style. Going forward from this book, I have adapted my process to incorporate some of the Photoshop techniques that we used in creating Izzy and have had great success mixing real world art techniques and digital manipulation.