let me explain it to you,
sometimes bad poly flow brings bad animation (sometimes)
you will get bad warping with it, things will stretch and shrink at the wrong times,
he looks very thin (side view)
he is very flat. and by the looks of things you have realy bad poly flow>_<
to tell you the truth, it just looks pretty bad, i cant realy crit it because of how bad it is>_< imo i think you should start again...