Super cool! I love the detail and subtle colors. I'd recommend scaling the head down though, right now its about a 6 - head tall bobble head. I did a quick paintover with a standard 7.5 -head tall proportions, and I think it looks about a billion times better. FWIW
Here is an update on a head sculpt that I have revisited for a personal project that I am working on at the moment. (The neck and most of the head will be covered in hair and armour so please ignore the weird shaped neck and the back of the head)