1. A bit to centered and the horizons are a little crooked (easy fix in PS).
2. Nice DOF and perspective. You might could have gotten a little lower and shot a little tighter (of course you were foot zooming
). The reflections aren't bad. A CP would have helped a lot.
3. Horizons are a little crooked, I like the lighting and the reflections are fine in this one. Could use a tad bit more DOF but probably the best of the set.
4. I like what you were thinking here with the garage door framing the car. However, the door being open and the fellow in the shot kills it. Exposure is good though.
5. Better composition in this one, as you applied the rule of thirds. Good shot.
6. Exposure and DOF are nice in this one, the reflections are a little strong though.
Good job taking the vehicle out an getting some practice with the 40D. I look forward to seeing more from you.