Due to the actual main reference sheet being traditional art, it has apparently confused people all these years so I finally yielded and made simpleish plain flat color versions for clarity. These are supposed to go with actual ref sheet so focus is on flat colors (and material placements).
I want to say that I absolutely don't require any exact hues, like, just do something along the guidelines. I make only traditional art and there's no hex codes or flat coloring comparable to digital flat, I don't require that. But hopefully this helps to figure out how to color a sin, since ref sheet images are heavily shaded and textured.