simple but nice. the color is great, even you just change a bit the levels
but:
the bg is off, and you see taht in the left side of the car, the shadow isn't right
the car body, on the red painted areas, have some sort of blue-ish/purple light on it, coming from a clear sky. but on the bg, you have a different kind of sky (color), so those blue-ish high-lights must be removed, or change de bg whit a proper one .. but that will involve changing the refs from the windows, bonnet and roof
and imo, the rear wheel look to tall, so the car look tall
+ you don't do refs from the bg ... i see somenthing on the side, but isn't to good