>  How to improve the lighting?

Are you aiming for something like this:?

http://www.motordesktop.com/wallpaper/supercars/Honda%20NSX%20by%20Duke%20-%201024x768.jpg

Build a scene around your car that is like real life.  Ie build a white 
ground plane and wall behind the car (opposite the camera).  Place a few 
large white blocks with high ambient to simulate the diffuse light sources. 
Leave some darker areas behind the camera so that you get good contrast in 
the reflection on the paint.  Probably need to use radiosity in conjunction 
with an array of light sources to get good specular results.

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