I too have blonde eyebrows (and now also white from aging). I had eyebrows in a slightly darker blonde tattooed on a few years ago. I am ready for a touch up. I don’t regret doing it.
A friend had lipstick tattooed which even changed her lip shape in the process. She was happy with it. She wanted a fuller upper lip. I admit, personally, I didn’t like the effect on her. But she was happy.