Constructive criticisms? Hrm ok I'll give this a go:
I reckon the last shot there totally looks the goods. Except shut the door next time..?
There's not much you can do about the location itself (unless you keep moving the car around to maintain the cleanest background at all angles. What you can do though is take a picture from a different height so the horizon doesn't go through the car and clash with its lines. I see you've tried to do that for #2 and #3, which is good. Level shots are great as long as you have an uncluttered horizon (or better yet none at all - eg Felix's teg shot).
Re angles:
Angles can suggest action or dynamism, but subtlety is the key there. Too much and the brain starts struggling to process it. Too little and it just looks askew. Also, preference of mine is to have the car pointing top right - don't know why but I do. Maybe it's the mind's way of \"reading\" a picture much like you read a book..?
Lighting is another key ingredient, but one most don't have any control over. Having a car this clean and shiny is obviously a problem because you're dealing with some harsh reflections here. Having it perpendicular helps a lot, like in #4 and #5. However I would also try brightening those pics and adding a little more saturation to make it really stand out.
If you have a DSLR, get yourself a circular polariser too and play around with it.
Wow, I've really been talking outta my arse here haven't I..?
Anyway, don't take anything I say here as \"definitive\" or whatever - I have my own tastes and preferences and as photographers love saying: \"Rules are meant to be broken\"
jonno.
P.S. I really did mean what I initially said about the pics - they're definitely a cut above the rest and I'm really nitpicking here.
(Perhaps we should also move this to the OT thread..?)