Being accurate is the key. Any child can build a kit and paint it, getting it right, that’s a different game. Yes many things can contribute to a dio, how about UFO landing on the battlefield. I would suggest you further research colours, Tamiya German Grey is not for everything.
I see from your posts that you are not an armour model maker. Armour is a totally different ball game from the tedious Routemaster kit.
Refinement is the lesson.
I am harsh but to the point. You will get there.