I think that the black car is way too big compared to the other two and the cars are too big in comparison to the petrol station.
Also are you going to do a proper road texture? the one atthe moment just looks like a very quick hypershade job...
are the cars rigged yet? it would be interesting to see some renders of some animations.
Alan
Technical Director - Framestore
Currently working on: Your Highness
IMDB