that should depend on the hero and their material settings I think. What hero are you doing? I know for example Vengeful spirit's specularity is INSANE
I think the sixe of the head is fine. With heroic characters like this small heads are always used to emphasize the muscular body. A good example of this is of superheroes.
Looking great so far! Could use a large gradient overlay to draw the eye to the middle of the bow. For example http://wiki.polycount.com/wiki/GradientMapping
I think there does exist the concept of a vec1 value. It's a 1-dimensional vector. Something like just an X coordinate, for example. Their length is their value.
Yes this is something I would like to share like a sort of tool for doing assets presentations for example. But at this stage it's only for my own use.