I think you actually did a really good job with the Background change and the color of the whole image.
But just try to slowly do more on each chop, all your chops tend to be abit too simple (In my opinion)
Have a look at the
donor central, see if you like any parts and just slap it on your chop.
Try to do more changes on your chop each time and develop and get even better overtime.
Also the reflection on the rear window looks strange, have a look at learning the clone stamp tool, it's a very neat and handy tool to know
Good luck

Post edited September 26, 2011 at 02:08:48 AM by J_HUI