I would love the link to the tut you are following as im working on a concept car aswell and could always use the help. You can PM is to me if you like, or send me the link on AIM, sublimedragon33

Also i think a small spoiler would fit the vehicule well. something more like the ones off the 2004 Honda Civics, or maybe the toyota celicas, low profile, somewhat form fitting really work well with that body style.

As for the only thing that looks weird to me in the grill but you said you still have polishing out to do(i generally work on the grill and small details last too), but ill follow this, ide like to see where is goes.