ooh, very nice idea

really liking the details - I can envisage this as an actual concept
a few areas to work on for the future though:
->its meant to be a realistic concept, so i doubt smoked rear lights would feature like this on a bmw, although i suppose it is still pssoible
-> exhaust pipes look kind of matte, they need sharp reflections and lines, and need to be a lot darker in general, with only a few light highlights... like this
http://www.bespokeventures.com/blog/wp-content/uploads/2009/11/imagedispatcherjsp.jpg
-> rear lights need dodging a lot more, to make them look whiter and pinker, then its more real
but really like this! well done

keep it up