Here's the current state of play on my Knight. The brassy bronze is finished, the silver metallics are almost complete, and a number of the details are complete too.
While at Kublacon, I asked the opinion of a few painter friends and the answer to the "dark or bright" question was, not truly surprisingly, "Both". I've approached it all as another, slightly zenithal, thing. Imagining a stronger light source from above, my upwards-facing surfaces are bright silver, while the shadows are quite dark/matte. As you gone further down the model, the metallics become less bright, perhaps with only a thin, glinting edge here and there.
These last two shots show that idea a little more, but also show the soot-blackened exhaust pipes and the rivets picked out in shiny silver.
Back to the grind ; )