So... this ain't looking too bad. In fact it's quite promising.
But, I do have some critics and tips for you.
First of all, delete the doorhandle. Seeing how flat it is on the real car you can easily do this with a texture. That'd also be more in keeping with the general lowpolyness of the model.
Further critics goes to your polygon placement. With your current polyplacement the car would indeed be quite lowpoly... but the way your mesh is looking at the moment it looks relatively unclean and if you're planning on putting it in a game or rendering it after you've finished it, your polyplacement will give you bad reflections.
I drew in a suggestion of a better polyplacement over your screens, I hope this helps.
Another point of critics is how flat you've made the curving of the side. Look at this pic here, you'll see that the side is a bit more curved than what you modelled.
Also, I noticed that there's a weird spot on the corner of the frontskirt.
Anyways, good luck with the model, I'm looking forward to see how this is turning out.
/edit: I just missed your post while i was drawing in that stuff... Let me just say, THAT ain't lowpoly at all. 3d seams = a big no-no on any lowpoly car.