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Compositing job? AE and C4D
Hi, this is a frame of the video just so you can kind of get an idea of what I`m trying to achieve.

Now, this was a test so the keying was done quick the color correction was done quick, EVERYTHING was done quick.
The scenario:
The camera is not moving. Planning on creating fake camera movement in post then opened a 3d model of a car in C4D, added a light in front of the car because the actor was also lit from the front only. Rendered the image as a PNG and added the photo in AE, then added the actor, keyed him out, then color corrected and then added two video I took from a real car so it looks like the car is moving.One of the videos is as you can see set on normal blend mode and the other one is set on multiply to create moving reflections on the car.
My questions:
How can I make this better? I thought about adding a shadow to the car`s seat but dont know how to without it looking fake as hell. Would painting the shadow work?What other things would YOU add to make this SELL to the audience better?
How can I light parts of my actor with fake lights in post? The “Add a new light” does not work on 2D layers.