Finishing the illustrations is not the end! I have to remember to leave time to prepare the illustrations for shipping. I've experimented with a number of preparation methods. These days, I am covering the images with vellum and shipping them inside a folder. I learned how to do traditional bookbinding in art school; various aspects of that process have come in handy for the folder construction.
It's somewhere around this stage that I begin kick myself for working traditionally. It's so much work to get a package together—not to mention the fear of it getting lost or destroyed en route. But I love to think about the recipient opening the package and spreading out the images. People can gather around and look at them all at once. Is there an equivalent moment when digital files are sent? It seems very different to me.