I like this model, but like with all upcoming models in the works it has a few negative things.
One thing for me is the hair, it's just too.....big and thick i guess....it's heeeuge
I did a quick drawover (i mean quick too, it's 1:30am and i'm tired) to explain really.
See on your model the hairline is kinda messed up, the hair isn't coming out of this head, it's just popping out on top of goku's bonce, randomly.
You need to visualise hair coming out from the bottom of the skull and swering upwards, remembering that the hair at the top, originates at the bottom and so it needs form.
On your model thus far, the hair seems to extend out from where there's no skull, and it's even coming out the bottom of the neck to some extent.
On the drawover i did, you can see the shape of the skull, and see how the hair is supposed to originate from the skull and really no where else. (see how it's not coming out the neck now too
)
Also i don't remember seeing goku's ssj hair that...large before. except in odd scenes when goku's hair seems the size of his torso
But i'm not getting at you, i'm hopfully encouraging you to push yourself to make this a Tip-top, grade a model
EDIT: Although not modelling related i remebered an old manga tutorial for drawing hair and it explains how to form hair on a head pretty well.
over at
here
P.S Sorry for my drawover's hair kinda looking more like vegeta's but you get the idea