I would say there are some noticeable points where some occlusion wouldn't go amiss, for still images sake. Perhaps some stronger shadows as they're quite hard to pick out, im looking particularly where the chains lie across the surfaces of objects. But it may be that the lighting is just very soft and so the shadows are also. I like the effect you have got on the fog, as if it's shining through a window/grill. Is that how you created the effect? shining a spotlight with fog turned on through an object, or have you mapped something to one of the lights attributes?