I don't think it is necessarily something authors have much say in. I went to a reader's day a couple of years ago and one of the authors disliked the cover of the book she was discussing. It wasn't a bad illustration in itself but it didn't reflect the tone of the book. However meaning no disrespect, she is not of the same status.
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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