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I realize that she changes hairstyles throughout the novel, it's just that the trademark short pink hair is the first image that comes to mind when I think of Tonks.
Thing is, that trademark is established partly by the illustrations (which aren't the same globally) and partly by fanon. I'd understand the fuss, except it's prefectly acceptable for her to have varying styles. Whereas, in contrast, Harry looks vastly different in the films, from canon, and yet no-one causes a stink about that. It's funny in the ironic sense.
Tonks doesn't have a set hairstyle, period.