Good idea cleverly done. Appreciate the shapes of front and rear, and colours of front and back lights and other nice details. (Agree with nutzito about photographic details, not that I'm a whizz).
I wonder whether filling in the 'body' with more yellow cars would have made it a stronger image? Although goodness knows where you would have got the extra cars from - you did well enough finding that many : )
Certainly hits the 'interesting and creative' bit though.