I have a suggestion, Don. I think you should go back to the file and start removing the rest of those black lines. Like the black line on the fender, for example, if someone isnt familiar with the Enzo design will think thats where the hood is. Remove that line completely and the Enzo will be cleaner.
The line could stay there, but its just an unnecessary line.
The same goes for the edges on the the giant intake along the rear wheels. I cant tell just by looking at it that the colors and depth that you used signify that the intake is beveled and has points.
Kill all of the wheel ones, because once again, you used so much depth and color that you can tell the angles and design is present.
DOnt even worry about the cabin though, those are fine.
The door only need the one signifying that its a door, the vertical line. The horizontal line you have added that goes towards the intake can go.
Once you have done that, Im sure your piece will be perfected.
Great work.