What all would I put in the literary analysis of the book overall.
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I think you should follow the themes of the novel and how the author conveys them to the reader. Check out the GradeSaver section on themes. Pick one or two and analyze how the author is able to convey the themes. Remember this novel is largely character driven so the key is in the characters.
Here is a link to the themes. I'd consider Gene and Finny as foils or Rebellion vs. conformity.