Nice pics! <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/thumbs-up.gif" border="0" valign="absmiddle" alt=':thumbsup:'>
As a sidenote, here are some things to consider while taking photos. No clue what kind of digital camera you have either, so some of this may not apply. I don't shoot digital, just not my cup of tea. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/hehe.gif" border="0" valign="absmiddle" alt=':hehe:'>
When shooting a large subject that is white like that, you need to open up at least 1 stop to render it white, and probably more like 1.5 stops, even. Unless, of course, you are trying to make it a different shade for artistic reasons, then don't bother.
Notice on the car you've got some major reflections going on (like off the doors and stuff). If I'm not mistaken, a polarizing filter will NOT clear this up much, because it's off a metalic surface, and the light is pretty much polarized already. The reflections aren't bad (I think you chose a decent off-frame background), though, but a way to reduce them further is to use a white sheet or something like that out of the picture on the reflecting side, so the reflection is white, like your car. You could have buddies hold it up or something.
If you want to get some absolutely amazing shots, go scout out a really nice location where you can shoot some good sunsets. The one you have would work just fine, too, though from a photographer's standpoint, I think you could also do better. Anyway, when you stop up to render the car a nice white, you'll blow out the sunset by a couple stops at least. So, if you have the ability, get a neutral grad density filter (2x or 3x should work, I think). This has the dazzling affect of rendering the car, foreground (to some extent), and the background in good detail and color. It takes practice and some time, but the shots are worth it.
Also, an interesting idea I tried with my friend's VR-4... Find an approaching storm, mount your camera on a tripod, and use a very long exposure to attempt to capture some lightning in the background. This is very hard to do (it requires figuring out the proper exposure to render the foreground and car visible, as well as the clouds and lightning), and takes some luck...and sometimes some courage. The meaner the storm that's rolling in, the better lighting you can get normally (and the nastier looking clouds too). Just don't stand on top of a hill, and don't let the storm get too close before you get in the car and move. But, it's fun to try and you learn a lot pushing the envelope with your camera like that. If you want to cheat, you can get a storm pic and photochop it back behind your car...but how boring is that?? <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt=':D'>
Like I said, I don't know what kind of setup you and your friend have, but that's a few ideas to think about. Even if none of them are feasible, it might spark some other interesting ideas for pics of your car that you can do. Since you said you're trying to pick stuff up, I thought I'd share a bit of my experience in that area.
Have fun with your cameras, our cars are very photogenic!! <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/hehe.gif" border="0" valign="absmiddle" alt=':hehe:'>