Girls, what is the secret behind making a nice looking hair braid?

Some girls look gorgeous with a hair braid (like on the picture below), though sometimes you see braids which are a turn off.
They're too dominating, irregularly shaped or just don't fit the girl...

Is there a secret behind making a good braid, or is it more a question of "if the look suits you" rather than technique?
Girls, what is the secret behind making a nice looking hair braid?
Girls, what is the secret behind making a nice looking hair braid?
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