I very much like the idea of having the one light source, the lantern, and the rest in darkness. I think the area you focussed on for the OSL came out very well, but I think the rest of the model is let down by inconsistency of light received; the white Templar Crosses, the blue robes and the skulls and seals for example are very much brighter than I would expect, and especially the robes aren't lit consistently to reflect the OSL.
You can try use grey to highlight the black armor and it will look very nice. For the face, try tone it lighter. For the skull, give a little more white highlight. Keep it up!!!