Why is everything glowing.. I think you need to take another stab at your post processing as you missed a few spots.. behind the TL's rear bumper it's a different colour, above the TL is all blurred..
I agree there is some room for improvement, but hey that's the point in experimenting.
I like the highlights and the look that the cars are getting though, just don't like how that look transfers to the backgrounds (and way off colors).
What were you using to light paint the cars?
The contrast in color from the ambient light vs the fluorescent is too much for my tastes. If you could tame the BG color a bit or possibly B&W conversion. The TL shot would have worked better if there was a highlight across the roofline. I love the overall effect with the long highlights. It really works great especially on the Black cars. How long of an exposure did you use on these?