Color!!! I learn't many years ago, when I used to build Stand Off Scale WW2 R.C. Airplanes that:
If you look at a color chip, it's about 1 foot from your eyes.
If you look at a 1/6th scale model placed ten feet from you..how much more atmosphere is the to take into account, Air has color, it's a foggy white.
Conventional practice on a stand-off R.C. plane was to paint the model based on colour chips, then when finished, give the complete aircraft a mist coat of thinned out white, all details included, canopy etc.
So if you're looking at a 1/24th scale McLaren how much atmosphere should there be between you and that car, if it was the real thing?
Let's say it's two feet from you. 2ft x 24 = 48 feet, what color does 48 feet of air have?
The static model aircraft people know this too.
Chris