I think the bg picture seems a bit lq. I like the effects and you did a good job on the manip (it is a manip yes? lol).
Maybe it was cause you decided to make the tag bigger and incorporate the whole scenery, but it looks like you just blurred the whole background, and didn't really do it progressively, so the car looks sort of placed onto it, imo. The actual effects on the car are really nice though.