Yeah good job on his expression.
You do needs some work on his gi the vest and legs(folds) look kinda flat and off.
Also you should turn that third upper spike of hair to the left, because it looks kind of weird facing forward like that.
And finally you should do something about his boots, they are way to straight in comparison to his legs that are so tilted. Just doesn't look natural, like he broke his shins or something.
Anyway that's my 2 cents, you got a great model going, but it looks awfully high poly.