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First you should take into account the vocabulary you are going to use.
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Identify the person you want to describe, if it is a girl, you use SHE IS or HERHAIR IS, if it is a boy, use HE IS, or HIS HAIR IS.
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Identifiy and choose the main information so you can work better with the description, like in the picture.
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If you need more help, check this video.
(https://www.youtube.com/watch?v=a-qeFD0aWEg) -
Organize your information, and finally it has to be like this..