actually this is awesome as is, as far as i'm concerned. if this were printed i'd buy it right now...people will probably tell you this needs color, but don't touch it. i like understated designs. very cool.
i think it looks great. the only thing i might want to see differently, is the smoke trailing from the car. it almost looks like the car is going to blaze up and break down after it lands.
maybe if there were just a couple thin black lines trailing, giving the impression of movement and speed, it might be more clear?
I think center placement would be better. A slightly brighter gray might help for the highlight color(s). Really nice illustration, looks like San Francisco to me.
I like the illustration and the colors exactly how they are - Bio-bot is right on the sub. Drop it on the template if anything but I really like the design a lot
Well done, I really like the style and perspective. I think you should add a hint o' color to the car, maybe in the tail lights, or by adding some sparks trailing behind. The grey is cool, but very dull. I think this would also work well large and centered.
The horizontal line in the foreground is a bit sharp. Molding it to the bump of the hill would avoid the impression that the car is flying into a set backdrop.