The hair thing I think is actually slightly different than the other sprites - your character's hair uses a mixture of 2-4 colors here and there for the outlines and definition, which at 1x muddies and turns a bit gray, while the outlines and definition on the sprites I was looking at (At least the short, blonde-haired ones) only used a max of 2 colors, one of which was usually fairly bold and saturated. I'm nitpicking here of course!