Test the various scenarios you have created thus far by combining them into command scripts. Always test what you have done.
Here is a complete basic test script it should render fairly quick.
This is a good time to test lighting and camera setups because this model is a low surface count model. You can move around in it and render the model easily. Check out the images on the next page to see how I developed the current lighting. After figuring out the best lighting scheme I saved only the light set up to a file, combined that as a file merge in a script and tested that.