Okay... I've compared your model to the car closely and carefully, and here's my list of tweaks for you. (sorry bout the nit-pickiness)
first one... you're missing the little grille on the left-hand side. Not sure if you were going to put it on once you were sure the modeling was complete enough to loose symmetry, but that's one of the things that's missing...
This picture also brings to mind that you're missing the pontiac logo on the pillar above the door handle... and also it looks like your handles might be made funky for the car. The Fiero's handle is within the black stripe itself, and the mark on the body color is the indentation so you can pull the handle out - it's actually a pretty low-profile handle, not sticking out any further than the rest of the black trim... It's also hard to see, but your gas cap might be slightly too far forward on your car, and a little undersized, but again that's hard to tell.
Okay, now the front emblem... it looks like this... here's two images, the darker one is the most accurate due to the edge distortion of the lighter one, the lighter one just shows the details better. ... Oh good, also found a nice one to build from:
You had the emblem shaped like this for a while, then you went to the regular pontiac logo... so this one might have been by your design... just wanted to throw that out there though
And the rear trunk has some ridges in it where the inside is lower than the outsides, like this drawing shows:
don't forget the key hole on it too
my last two nit-picks are:
the headlamp doors are flush with the car body, it's hard to tell from the pictures, but yours seem like they might be extruded up some. that might just be the bevel playing tricks on my eyes though...
and finally there's a body-line that you haven't modeled in yet at the front end. It extends down the sides of the hood at the front, and goes down to the body trim. The trim itself I believe is also split up here. The position of that line on my prints is correct, but the position of the turn signal isn't - it should be about an inch further back from the front of the car.
The car model is great so far as it is, I'm just listing these out for the sake of accuracy.