Tennis car

A friend of me asked for a concept including tennis, sports, and car. First I made all the car with tennis balls, but it was hard to see the car. So I thought that putting inside some seats, belts, the wheel and some plastics while give the feeling of a car. For the background I made a soft blue color gradient instead of a nice compo with an awesome background, to catch te attention at the car, instead for the whole image. What do you think? Shall I add more items or change the angle, etc? All feedbacks and comments are welcome. Enjoy! :)