Okay, Hope you know that its me tryforce
So anyway:
i would have suggested to work more with lowpoly , shaping up the Model itself in Midpoly. Then Nurb it.
From now it looks very decent.
Like Shiro Pointed out you got some wierd flow in there, though i know why you did that, its not wrong, just need more defination and work at this Part.
I wuld have loved if the head would have more Polys and a greater defination because for now he has no great character in it.
Really like how you come back surprising everyone. Still remember your Goku =P
keep it up!