How important is physical attraction to a relationship?

There is this girl I like.. I really like her personality, she pushes me, she supports me, we click and have chemistry. She has a great body but her face just isn't super appealing. She isn't ugly, just doesn't have that face that makes me attracted to her personally.. can we be in a successful relationship or can anybody, or is it going to fail because of a face?
How important is physical attraction to a relationship?
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