Good Job, a nice tabletop quality pieve with a face that says what he's haf to go through :) But if you have some more time
for your models i'd reccomend a drybrush
og GW's Codex Grey or any dark grey color.
It picks out the highlights and makes the armor look battle worn, or if you got loads... do some lines with a grey on the edges.. i see you got some nice brush control so you should be able to do it.
Good Luck !