What is the purpose of a peer review of a literary analysis essay?

Because this way you can find ways to improve your writing and literary skills 

If you look at your own work, you won't really notice your mistakes easily. If you have a friend or peer take a look at the work, then they can help you point out errors or flaws in the essay. It's mainly so you could have a sort of second opinion on it.

By by showing how hard it was for the sisters to feign grief

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