Deeper shading overall, slightly more highlighting as well.
With regard to darker shadows, I think it would help a lot if you just emphasised the edges of things - doesn\'t have to be as stark as blacklining, but IMO in minis (particularly in very small minis) there should be a very dark line between things, e.g. where the right hand grips the axe haft.
The metallics I like the look of; I\'d probably go a touch darker in a few spots but they\'re nice as they are too.
Unless it\'s just in the photo also aim for a more-uniform matt finish for the cloth.
Last thing I just spotted. Re. the mud on the hem of the cloak - less is more. You can certainly go that heavy but I think it would look better if you built it up more slowly, made more random marks with the brush, to get to a generally more \'organic\' effect.
Einion