Not a fan of the jet black panel lines, they look too "obvious." And because on most models they're out of scale (too big), making them black like that makes them even more obvious.
Look at a real car and you'll see that they're never black like that, but several shades darker than the body color (unless it's a black car, of course!).
Here's a real one, similar to your model. Compare how the panel lines look on the real car vs. your model: