I didn't even pick up on this before but thanks to the way you paired these pictures, I now know what is the difference between the cars:tup: The Factory car is the Le Mans Spec car while the Oreca car is the LMES Spec car.
I'm new to the gt5 Photomode, but I think the best moments for "real looking" pics are in morning / evening time events, as I feel the light coming from one side really looks "the real thing"...
My first attempt (I know it's not perfect) (forgot to add, NO Photoshop / editing at all)