If you don't like it looking like a kid did it in kindergarten, maybe you can give it a coat of clear on top and polish it out a little? I am not sure about the texture on the real car but the real car's paint work should look more smooth when viewed from afar (5-6meters), like the way you look at the model normally.(25-30cm)
Painting the window trim flat black instead of gloss black also makes it more realistic.
Good job.