I think there are some presentation tutorials around on the website, go and search for them. They're somewhere in the NFS Carbon section.

Telling people, 'if you don't like my cars, don't comment' is not going to get you a fan club anytime soon. You told that to me, I wouldn't even read the next line. You can't really tell people what to do, period.

netcarshow.com have good backgrounds usually, and google is handy.

Tutorials:
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Good to see you give photoshop a go. It can really help you get more views, more comments, and hopefully you'll learn something useful along the way. It gives you a better eye for detail I find... and now I'm trying to be artistic in all my cars.