I really like the composition and the border finishes it off nicely. Nice work with the lighting too. The empty white space on the right really pushes the blue plastic making it look hard and bright. This would also make a good black and white image.
A little too bright, as the tires are just a tad washed out. Fairly good detail on the car. I don't think negative space in this image works - it actually distracts the eyes.
No frame of reference, does not meet the challenge. Compose and photograph something "miniature" in such a way that it conveys to the viewer that the subject of your photo is a tinier version of something that is normally larger.