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Based on reading a bunch of interviews with editors of literary magazines and small presses:
What editors want in writing (especially poetry)
exceptional craft, quirky, real, beautiful language, musicality, clarity, purposeful imagery, effective metaphor, you have found your personal voice, sincerity, passion
Common problems in poems (and prose)
too much on the page or too much left off the page, frontloading, backloading, explaining away the magic (over reveal), vague, experiment for the sake of experiment (in turn, incomprehensible), purposefully obfuscated so clarity and intention becomes lost