Alternatively you could try transitioning to the Sith eyes when he looks up from the light saber as it penetrates his body
Hey I gave this a try, and it’s interesting (very horror movie like), but I think I the other ways better:
Snoke Sith Death - Eyes turn when Lifting Head
Reposting the other two to consolidate:
Snoke Sith Death Strong
pw for all: fanedit