The improved shading and added detail look great!
Also, awesome job on the eyes, they look fantastic!
I'd like to denote another "issue" about the head
that Chaco also brought to your attention. You're
probably already working on improving this, but I
just thought I'd mention it anyway...
The beard has a very awkward feel to it. Almost
as if it was latched onto the black piece around
the neck (I'm not quite sure what this thing is, to
be honest. Looks like he's wearing a Gantz suit).
Maybe if you could "fuzz" it up as well and give
it more dimension as to make it look like it's truly
above the -- Gantz suit.