Great shots Ben, but as Mentos mentioned it's tricky to comment on so many (my brain doesn't hold that much information!). Anyway, here's my offerings:
1) Subject's a bit lost with such an interesting background and the shadows as mentioned.
2) Again, the background is a bit too dominant. Lost the blue sign and crop lower perhaps?
3) What Mentos said.
4) A great shot - looks really pro, easily good enough for a car magazine. To be finicky, I'd look at what it's like with the tarmac/water line horizontal, rather than the car as it's so close to horiz that it makes me *want* it to be either straight or more diagonal.
5) Not such a good backdrop, what's that white pole thing? Is the lighting quite right on the LHS of the car? Easily rescued by a selective desat of the backg and maybe a little defocus on the backg as well.
6) Roofline of the car is spoilt by the banner and the sky has a strange green tint in places.
7) Good stuff, but... I reckon to make the car look like it's moving forward, you should crop to the front bumper and leave trailing space. Having more space before the direction of motion makes me wonder. I'd possibly think about losing a touch from the top and bottom to get more attention.
8 ) Great shot, perhaps less dof to make the background go away a little?
9) Excellent, but... Roof line of the car again.
10) Roof line of the car again.
All in all, great shots. I think by including many that you've illustrated your grasp of taking cars - you're not afraid to get down low which is an area most people forget about. However, I'd say your biggest weakness in the shot is where something in the BG has upset the form of the car, particularly on the roof-line. I can see it was a very bright day, but a smaller depth of field would help blur the BG, and a little more care would make them even better.
Rob
p.s. Try a silver metallic car next time and you'll find it much easier
