We went through an era where panel lines and rivets were overdone to the point of making you ill.
Panel lines, where used, should be in good taste, and used only where they would show on a real airplane. For example: a 30's style fabric covered airplane, will have lines at the root fairings, or inspection panels, which in most cases are under the wing.
Rivets were a major problem. In the aerospace industry we even shave rivet heads to make them disappear in order to meet aerodynamic zone requirements. Personally, I have never seen an airplane with all the rivet heads painted black!
Use these items in moderation.