Before sending off an article or chapter—and even before mentally stamping "ready" on your work—read it over and over and over again. Always take notes or make changes as you read. Try to improve it each time.
There is a point at which you have read it enough and you need to let go. But many writers err in the other direction, by not giving their work sufficient careful reading.
And be sure to read your article in its entirety. Computers and word processing have made it really easy to make changes. Sometimes writers don't consider how an inserted sentence or changed word can affect the whole of the document.