I'll second the question about the jaggy lineart. That is really bad.
The coloring is pretty decent. Might want to give the cloaks a few highlights as well as some shadows, although that's not always done with cell shading, I know. Also, Hidan's face needs a few shadows, plus the shadow the collar is casting doesn't seem to match up with the one being cast over the upper part of his head. Are they from the same light source?