Hi Lon,
I think the distortion you see is due to my bad picture taking. When I shot the picture I noticed this warp at the edges, which I took out by cropping the image. I am so used to seeing this image, that I did not notice the distortion until you have pointed it out.
It has been a long time since I have done a drawing such as this, but both the reference and the drawing were taped to a board and placed upright on an easel. Since I would get tired standing for hours, I often would sit in front of the easel, which in turn gave me a lot of stiffness in the neck.
I have checked and rechecked all the measurements with a proportional divider, but I will check again the areas you have pointed out to make sure I didn't stray.
Thank you for your observations.
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