@Dunchenman: You need to know a little about how colors work and look at some references. In this case, I took some images of a suit in the sun and separated it into a selet color palette. After that, I tested which ones worked best with which, and this was the result. It's not recommended by any serious designer, but unfortunately, that's how my creative process works. You can achieve the same result with much less work by learning color theory and the basics of saturation and light and shadow.
@Coemskong: An important tip: don't leave all the shading work to AirBrush. It's an excellent tool, but relying too heavily on it makes the drawing look lifeless, and it doesn't handle colors correctly.
green silly motorcyclejak: billions must vroom vroom!!!
I'll try to learn how to make these shades