7 - Good. Criticism; difficult, as this is fairly well flawless, save for perhaps the odd green at the top, but minor. But in my opinion, this shot / set-up needs something to 'lift it', not sure what, nor how. Whether a horizontal crop instead, or a 640 x 640, or a different colored 'base' (even though it is kind of 'road like'), or unusual lighting, not sure. Maybe a frame in this instance would have helped, no idea.
Very nice photo. It's bright and cheerful. I like how you setup and composed this photo. If you have chance after the voting finishes, please PM a little information about these little cars, they're pretty cool.