Isn't FW super forthcoming with their paint schemes upon e-mail request? Otherwise I would try bronzes (maybe Sycorax Bronze?) washed with a Nuln/Agrax mix, drybrushed with the starting bronze then edged with Mithril (?) Silver and maybe finished with Skull White.
Regardless, it looks painted, washed brown and black, then drybrushed twice (first time with base colour second time a brighter highlight on just edges). I say drybrush but I never do it...I always layer highlights because I have more control over it that way.
Hope this helps somehow! Awesome look, totally agree on the subdued tones