First, I don't know really how you can criticize that cuz it looks sweet as hell. I guess if I had to be really picky I'd say add tire tread maybe cuz even though the wheels are perfectly executed, with the pitch black tire it could be perceived as crooked looking. Other than that awesome job
Second, do you take logo requests? I need a very simple looking Advan logo and I've had an impossible time finding one on the net in vector format (like for decals etc). I'd try tracing myself but I don't have illustrator...
-IR