In general, write as a reasonable person writing to other reasonable people about something interesting. Good papers usually persuade readers that the writer is level-headed. Be as specific as your purpose allows. It is difficult to strike the right balance between general statements and detailed ones. Try to choose the most specific word you can use without losing your meaning and to illustrate your meanings with examples.
Good papers make clear statements.
Try reading the paper over with the attitude that you are a reader who has never seen the paper before. Try reading the paper aloud. Mark the places where you hesitate or stumble and then figure out what caused the hesitation or stumbling. Try giving the paper to someone else. Ask them to point out parts they don't understand.