I have now modified my set up with the addition of a Photoflex 12-inch white-translucent Litedisc diffuser. The diffuser is placed between the light source (the sun) and the subject. I held the diffuser in place with the other Wimberley Plamp, attached to a tripod leg. I positioned the diffuser as close to the subject as possible without it entering the field of view through the lens.

Proceed to Photo 4