Girls, how can I hint my girlfriend that I’d like her to try a different hairstyle/color? Am I wrong to even suggest it?

We’ve been together for more than 2 years and she’s had the same hairstyle/color since I met her. She dyes it black and it’s not that it looks bad on her, but her natural color (light brown as seen on childhood pictures) or any lighter tone would be way more suited for her. I don’t want to hurt her feelings or make her think I’m not attracted to her…

Girls, how can I hint my girlfriend that I’d like her to try a different hairstyle/color? Am I wrong to even suggest it?
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