Really good looking Audi, simple chop is nice!
-One thing I'll point out is that, you should never use the same wheels for the front and back!
-When I brighten up the image and zoomed in, I noticed the side skirt was not finished and the tyres are not connected as well.
-Police cars in the back have a bright area on the bonnet due to the sun on the right, you can make the bonnet on the Audi brighter too.
-The direction of the shadow (from the building) is different to the one on your car, so I recommend removing the shadow on the right side so it blends in better
Small details to keep an eye on.
Keep up the good work and You'll be pro soon!