LOL I was waiting for everyone in the calendar to jump on me for my composition points, guess it didn't take long...
I would implore you to compare your pic (which is the only rear shot of a car, kudos on that) to the October pic. Similar color tint organic backgrounds, both black cars, both shot at an angle, both shot in adequate light... So whats the diff? His is shot on a road, and yours is shot on grass. Lets face it, our cars aren't offroad vechicles, they just don't look right on grass or dirt.
I actually grasped this concept of, street cars need to be on a street, from a widely known publication. Anyways, I'm not saying that pics that ignore what I said look bad, they could just look a little bit better.