I agree Icemanfred, some soft light from above or below to give the head more depth. But if that doesn't work out, its not like you are striking out. This looks amazing. I love the inner ligh in the chest. Great work.
That chest came about as an accident.
I was having such a hard time trying to make a rib cage from tubing. then add paper mache (which I hate working with.)
I eventually took a rib cage from a skeleton and applied thin drop cloth and heated to shrink around the ribcage.
It didn't get the same bulging rib effect.
So in order to make the ribs stand out better I back lite them with a small led nightlight.