It depends on the drawing. Amano doesn't draw preportions, or even color, or anything the same in ihs pictures. The colors used in his drawings are used to portray a certain emotion about a character.
For instance, Cyan. Very strong, with dark hair. Eiko has green hair with green clothes in one picture, and in another she has blond hair. I think a lot of the reason amano's drawings have so much white/blond hair is because the color of the person's hair shows a certain emotion he wants (along with many other factors: the clothes, the style, everything). In many cases, white hair shows age, such as Galuf.
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