Examine your sentences. Use strong verbs wherever possible. Use the active, not the passive, voice. Try not to use the same words everyone else uses, unless you have a particular reason for making your piece flat. Flat is not what usually works, because flat is boring.
Examine your paragraphs. Do they lead from one to the other in a way that makes sense? Does each paragraph carry an interesting thought, a wonderful sentence, a joke, an astute observation, something to mull over? You do not have to have all of these in the same paragraph. George Garrett advised us to touch base with each of our senses (sight, sound, touch, taste, and smell) on every single page. It is good advice.
If your piece contains chapters, ask yourself if you have started and ended them at the most effectual points. Until you reach the end of the piece, you want each chapter to tantalize the reader into the next chapter. This is called narrative drive. It was not always seen as essential, but today it is essential. Without narrative drive, a story withers on the vine. More… “Poetic Praise”