How thick of eyebrows are too thick -in a dude?

Taltos
How thick of eyebrows are too thick?

And which eyebrow shape do you prefer?

My girlfriend told me she likes mine, but that not all eyebrows are nice looking. I don't get what kind of eyebrows do you have to have for them to qualify for being ugly! Haha

Links appreciated
How thick of eyebrows are too thick -in a dude?
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