The photo for this sketch had a good range of tones. However, I chose to use a brush-tipped ink pen for this portrait. Perhaps a smaller tip would be better if I were to replicate the tones from the photo. My brother Mike‘s eyes diverge. Sometimes he looks with one, sometimes with the other.
Here are two images that I remember distinctly from one of my dreams. I used the upper image as a model for Walking Man on Divided Plinth.