It's a thin line, but don't show off, even when your fingers are dancing on the keys, celebrating the pleasure of words. And be honest more consistently than Hemingway. Reexamine the last sentence of every paragraph, the last paragraph of every scene, and the last scene of every story. If so, dump the summary. End your paragraphs, scenes, and stories with action, not reflection.
Structure Tell a story.
Something has to happen to someone. That may seem to go without saying, but remember that a story without plot is like a meal without food. The story starts at the beginning. It must hit the ground running. The first sentence in the story must be the best sentence in the story.