Cheers Mike, Simon, Mario, BP, Ken, Mobo, Nap and Stefan!
Mario, the darkness comes from two things. First off, the figures are painted starting with a base of something much darker than normal. Think of it as going with the first shadow as your midtone and adjusting everything from there. The second is playing with the levels in your photo editing tool of choice. I use GIMP because it's free and honestly, as good as Photoshop without the proprietary Adobe bells and whistles that most of us will never need. Click for full size
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On the left is the original, and the right has had the gamma (or mid) reduced by 8%. This darkens all the midtones and shadows slightly without altering the colours much. I also bump the contrast a little as well after, so you have to fiddle around a bit to understand how far you can go with either before you start losing information or change the overall feel. I normally edit all my photos for the simple reason that I don't have a permanent shooting space so the lighting and camera setup is always somewhat different from project to project and often from session to session. It sort of sounds like cheating, and if we start splitting hairs, it is. High end cameras have all this software built in so that when you adjust the settings on the camera for your shoot, all of this is done automatically. Again, hair splitting. Personally, I just try to get the best photos possible while remaining as true as possible to the original. One tip for shooting with a dark background is to bump back your exposure +/- on your menu. Unless you really know what you are doing and have a good camera/setup to begin with, your camera is probably going to read all the available information and come up with an exposure that is way too bright to compensate for the dark background.
Kimmo