Other than it being a superbly built car, I can't tell anything super special. I can say that the interior looks great for having been brush painted, so does the trim. If you give the wheel centers a very light acrylic wash of very thinned out black, paint the center caps gloss black and the lugs chrome silver, that would make the visual impact that much better.
You did a fantastic job on the paint too, hard to believe you got that good a shine from just metallic paint. Usually polishing metallics makes them dull and the sparkle goes away.