ok heres some problems:
- face too crunched at the face mask part, looks odd on a circle
- cut off for the wood transitioning into the face is awfully abrupt and not realistic
- as bad80 said too many layers
- wood looks cool but not really natural, kinda plastic and controlled
- shadows way too mirrored, light doesn't strike equally on both sides
Suggestions:
add scratches/deformities?