What makes a good photograph?

I posted some pics of my 156 yesterday in General Discussion. Although I was not looking for 'Artistic impression' awards I would deffintely have welcomed some and got some advice/opinions on how I can make it look better.
I am always looking for ways to get better pics of my car and anyway I can make a car that looks perfect in the metal look as goot on film is good to me.
I definately think people should not be critical of pics with out backing it up. It is a car forum after all and totally agree with BF that it is what we need.

Thanks.