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 are lots of artists in the world. But there's only one you. And the only person who has your point of view is you. If you decide not to make things, all you've done is deprive the world of all the stuff that only you could have brought to it.
Neil GaimanA god's relationship to the world, even a world in which he was walking, was about as emotionally connected as that of a computer gamer playing with knowledge of the overall shape of the game and armed with a complete set of cheat codes.
Neil Gaiman