I don’t work on image processing but do own $400 professional pencils and use an sRGB monitor and have been producing “high end hobby” level works for a couple

I don’t work on image processing but do own $400 professional pencils and use an sRGB monitor and have been producing “high end hobby” level works for a couple of decades I would urge away from using an entire human portrait. Decontextualised elements of the human form register a lot more accurately than an entire face. I spend a great deal of time trying to escape viewing works as a face holistically as it tends (from my subjective experience) to trigger a different part of my brain than the area responsible for visual differentiation/assessment I would think that something similar to this would be better for researchers to quickly and accurately gauge DSP effects than a whole portrait: https://en.wikipedia.org/wiki/File:Missing_Link_by_Nick_Murphy.jpg https://en.wikipedia.org/wiki/File:Missing_Link_by_Nick_Murp... Obviously much better curated than the referenced image