Im not really 100% when it comes to lighting but those renders look nice. The first few especially. Looks as though you are using radiosity to light the scene... since you are doing a still scene, meaning that none of the parts will be moving aside from the camera, I believe you can just bake the radiosity on the scene and then you can move the camera around freely without having to rerender the radiosity. I believe this works for walkthroughs like (Im pretty sure) you are trying to do. Either way, hope that helps... good work thus far, post new pics when possible, later.
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