This book was recommended by someone on Facebook and I recognized the author as the person who made the ceramic eye-painting molds. If you attended the Beautiful Eyes workshop we had last year, we used her bisque pieces in class.
So I searched for the book which is no longer in print and found a good used copy. It includes a full-size color poster which we will probably laminate before posting on the wall of the studio. The book includes step-by-step instructions on painting human eyes in various expressions. Also, animal eyes and comic eyes. You are welcome to look through the book when you are in the studio and reference it ini your painting.