Have you seen a recent photo of Billo? Someone posted one last night. Slick looks like the painting Dorian Gray kept in his attic just before he self-destructed.
I've seen a couple where there's this hollowed out look in his eye sockets. It reminds me of looks I've seen in Alzheimer's patients who weren't quite all there. Not blank (yet), but a touch unfocused on the here and now.