Very cool concept and aesthetic. The first thing that strikes me, as well as probably other viewers, is the lack of believability in the deterioration into a skull. It's a pretty clean shop, but pulling off that look takes a lot of practice and experience. I sure as hell can't do it. However! The skull-on-top-of-skin look sort of works. Or at least, it has potential with the way you composed it to black out the eye. The angles around the temple and jaw seem angular and unrealistic. I think this is something you could run with, to create a something surreal and a bit beyond real life. You could stylize the entire skull and make it work as a design.