These are really tiny, so there's only so much you can do. Rotting flesh takes into account degrading layers of flesh. First, there's no blood, or oxygenated blood, so the undercoat would be bluish or purplish like a bruise. If you really want to be technical, unoxygenated blood would follow gravity and pool at the bottom of the body in a post-mortem lividity. So the feet would purple-blue-green and gradually fade the farther you go up the leg. Maybe ghouls pump blood, I don't know. If that's the case, then not so much lividity. Fat and calloused flesh would show up on top of the undercoat as pus-yellow in colour. So, that might be a bit on the face, the belly, the chest, the buttocks, maybe the upper arms. Then dead flesh on top of that would be whitish or greenish, or bruised. You could maybe make flaps of skin with thin scraps of epoxy. All of these coats would be super thin, though. Maybe you'd see some atrophied arteries and veins, and the eyes would be bruised sockets.
I painted three more ghouls before reading this comment! Argh! Well, I think I have a couple more unpainted ghouls left, so I can try your technique on those.
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