I spent a while this evening sanding half of Novella's face. It was an incredibly dull, unrewarding activity. I used the finest grit in my sandpaper collection: 600. I was clearly doing something, judging by the resin dust coming up on the paper, but I could see no appreciable difference in the color of the sanded half of Novella's face versus the unsanded half.
I suspect that I may be using a grade of sandpaper meant for light finishing, rather than actually scraping shit off. I also have some 220 grit in my collection, so I'll try that tomorrow on an inconspicuous location, like the lower back of her skull.