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Ha! You go ahead and take a big brush of black and paint it over hours of work! See if you don't suffer the heart racing, light headed sensations.
Then you wipe it down. It leaves something like an antiquing stain to the surface. Not really glazing with medium. But a way of taking it down a bit. Looks like I'll have to do it again to some of the brighter areas on the left. But in person, it makes a huge difference in how the subject, Wayne, reads.