Reflections are kind of flat as they are....you should use the same pictures you have used for the reflections but put them through a filter, I think liquify is probably the best for doing curves and stuff all in the same reflection on one part of the car. Also, figure in perspectives on the reflections, they should get smaller going towards the rear of the car...
It just doesn't look right, the reflections are just straight pictures, go out and look at a shiny car, no reflection you'll see will be an exact mirror image of anything that is at a distance, things get warped/squished/twisted/mangled when they are looked at in a shiny, curved piece of painted metal.....look to the real world for your help in what you need to do to make your reflections look right...
EDIT: Imagine your eyes are guns, 'shoot' the piece of metal you are trying to reflect, the 'bullet' will hit the metal and glance off and hit something.....that something is what should be reflected into that piece of metal.
The side of your car looks like it has one piece of metal facing kinda up and one facing kinda down, the one facing down should reflect the ground and not much above the ground, the piece facing up shoud be reflecting more of the tops of buildings and sky.....just use your imagination and think about it before just cutting out one picture and placing it on the side and turning down the opacity, it just doesn't work like that in real life....
Sorry for the long post but I've been trying to think of a way to explain reflections, this is everything I've thought of that can be put into words...I'll try to make a sort of tutorial on what I'm trying to say, not so much HOW to do reflections, but how reflections work in real life...
EDIT AGAIN: Just put this together real quick to try to help, let me know if you get it......
http://www.photoshopchop.com/forum/s...860#post169860