Duplicating this from the Ascendant thread since it’s not specific to that project: what if evil Rey had Sith eyes? Here’s a test of it in motion. They could be obvious or subtle, or have her whole face look more vampirey.
I suggested an idea one time to have Palps’ eyes be pale the ENTIRE time after he sucks up the dyad, to reinforce he’s a spirit possessing a different body. Try experimenting with this idea.