for just a quick idea of what real paint should look like just turn on ray tracing in your render globals window for settings. it will give the body reflections, and that gives it a bit of depth, anything beyond that, do a search on the forum or grab a tutorial off the net, there are tons.

furthermore, the shape of your headlights is waay off, here is a pic of what they should look like

and from experience, if you are too lazy to do the handles and mirrors now, once you get the paint the way you want it you will find it even harder to go back and continue the model.

also, the front signals are pictured, they are orange and in the front bumper