Fantastic work David! (hey your name evokes me something Moebius !)
i like the first render of what you posted over the last one : better lighting IMO and it feels really natural. and believable last one has a more crisp feeling so beliavability is a bit off.
but naturally it is a gorgeous work however and model looks great!
while i am here i wanted to ask if for the animations are used the low res model with normalmaps/displacements or higher pollycount models exported from ZBrush - for render purposes ? know a person saying in animations inserted in games they still use uge polycounts for models ?