Now the axe looks like stone - which doesn't have to be a bad thing, especially if that's what you wanted

It's not bright and shiny enough for NMM, and the roughness and limited highlights make it look like stone.
I love the base - it's pretty interesting and well modeled.
What I would change is the skin - I think it needs to be shaded a bit deeper or highlighted a bit more. Of course it may be just my personal preference, but I think it would make it look more interesting.
BTW what range is this mini from?