The best advice I can give on this is, once it's done, to put it away until you can read it with new eyes. Finish the short story, print it out, then put it in a drawer and write other things. When you're ready, pick it up and read it, as if you've never read it before. If there are things you aren't satisfied with as a reader, go in and fix them as a writer: that's revision.
Neil GaimanThere's a tale in the Caballa that suggests that the Angel of Death is so beautiful that upon seeing it (or him, or her) you fall in love so hard, so fast, that your soul is pulled out through your eyes. I like that story.
Neil GaimanThere are stories within stories, whispered in the quiet of the night, shouted above the roar of the day, and played out between lovers and enemies, strangers and friends. But all are fragile things made of just twenty-six letters arranged and re-arranged to form tales and imaginings which will dazzle your senses, haunt your imagination and move you to the very depths of your soul.
Neil Gaiman