After much deliberation over the colour scheme for this guy and what techniques to use (NMM or metallics) I found he wasn't getting done so I stopped thinking and just painted. Went for metallics, using a combination of Citadel and Vallejo metallics. The armour is basically Vallejo gunmetal blue mixed with black and progressively highlighted with Vallejo steel. Guilding is a mix of Citadel Dwarf Bronze, umber and black highlighted with bronze and gold. Weapons are a Citadel Leadbelcher and black mix highlighted with chainmail, with Vallejo smoke washed over.