Getting close to a source for f85r2

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For what it's worth, another model trained on ink (the results of which I've been planning to add to my site for a while...) shows some ink line on the forehead of "the doctor", suggestive of some headgear.

The line on the forehead of "the doctor" might have been like the one on the forehead of the figure on the right side of the next page (f86v4). Barely visible, like the veil on Mona Lisa's hair.

The character on the right has some kind of optical device tied to his head with a rope. Possibly glasses.