It's easily one of your best updates so far, speedster.
They're not flawless of course, but really show you're improving and tryong new things, which is always good. One thing though. You should think of resizing all of them, mainly the Ford GT shot, it's just too big.
The R8 is a very simple shot, but works well. Car looks very clean, rims look nice too, only thing is there's not much to look at in the shot. It would probalby look more pleasing, even without any further changes, if the car was a bit more to the left or to the right in the shot, the centered car feels somewhat uneasy, it would compose it better. 👍
The Zonda is my favorite. I'd do the same on this one regarding left/right as explained above. Car also looks clean, blur looks very natural, the most realistic of the bunch.
Only flaws I see (worth mentioning) are the front wheel (like Bram said), and the car cutout on the rear wing.
The Ford GT has a great mood, lovely colors, and the rims look especially good. I love the light on this one. It's perhaps too soft looking. Did you use a median on it?
Also, the smudge tool is your friend when regarding jaggies like those seen on the rear lights. A size 5 at a ratio of 20 would take car of that easily.
![Wink ;) ;)](/wp-content/themes/gtp16/images/smilies/wink.svg?v=3)