From what you've got so far i can hardly see the spec at all, unless you havn't put it on yet? I'd imagine the metal fist to be much shinier.
Also i'd maybe add some colour variation to the AO and some blends like the gold mace here:
See how it stays mainly gold but in the shadows it goes into a blue tinge. It's kind of the polarise render setting effect that you can get from marmoset but it'd be in the textures instead.