I'd stick with what you have for a while. For realism, you might consider modeling or tweaking meshes to enhance the scene or clothing, etc. Especially if you are doing stills. The human eye can spot a flaw in a nanosecond. Reducing the "physical" flaws will get you realism before a 5000 dollar renderer will. You can modify the figures to look less like the original too. Then hack the cr2 to accept your modified mesh and still behave.. The "art, science" of light is a biggy too. Moreso,,, getting the best "compromise" in quality/versus time... Tried to find a "real" render in my HD and could not,,, ;) back to the drawing board. This is a Zbrush hack into Poser6