When I was searching for books that teach long-and-short embroidery I came across the book “Beginner’s Guide to Silk Shading” written by Clare Hanham and published by Search Press.
This is a short book (48 pages only), but the information it contains is great.
Clare teaches silk shading with four lovely projects---Climbing Leaves, Tulip, Butterfly, and Dog Roses. Each project is described in detail with step-by-step color photographs. The book starts with the Materials section, followed by Techniques, How to Start, and then the projects.
Clare also gives ideas on what ways we could use these projects. For example, you could see the photos of the butterfly silk shading done on a trinket box, framed as a wall hanging, or sewn into a denim bag.