Hi. My fly pattern photography is still in the "beginning amateur" stage, so what I do is illustrate my patterns posed in the vice using colored pencil. Here attached is a recent example --
Most (if not) all fishing mags focus on fly pattern photos. I hope to one day put out a book of fly patterns with tying directions all illustrated with these kind of drawings. One book out there already is Jack Pangburn's great Deer-Hair Fly-Tying Guidebook: