It shouldn't but in story telling, particularly Disney, there are characteristics used to distinguish hero and villain in a stand out way. I can't speak for Teacake, but it probably is my mind seeing a pattern surface. Dark eyes equals to a varying degree, suspicion, paranoia, distrust, and/or black heart. This villain may possess one or none of these. it's interpretation of the artist's imagination. I'm not implying it's law in fiction. I've just observed this in cartoons in particular, even comic movies. I use a lot of symbolism in my art and look for it in others. It again, doesn't mean I am correct. Could merely be my interpretation. Did I make sense? I hope I didn't go off on a tangent. lol.