I know it's a ways off, but when Luke pulls off Vader's mask in JEDI, here is a possible take on what to do with the reveal:
http://www.youtube.com/watch?v=M6JloWnQRp0&NR=1
at 5:08: "I imagined that beneath the mask Vader was hideous; his mouth was cut away, and he had one eye hanging low..."
Maybe instead of seeing Ani's whole face, you could just do a close-up on the eyes with Luke giving a disgusted, saddened look (?)