Actually the wings were painted silver, not light grey, but only the wings and not the fuselage.
On top of that, silver is still reflective (even though it's paint, not natural metal). It would "look different" but not look overall flat and formless
EDIT: You shouldn't take it as a nitpick. IMO it's kind of important. It would be like my first P-47 attempt, or most IL2 BMF skins, you have to color in the details to give the illusion of metal (even beat up and distressed metal). I'm not saying it has to look like chrome, but now it looks like plastic.