Most important: The single greatest difference between amateur writing and professional writing is, the former is all about the writer. I, I, I, me, me, me. If you’d like an illustration, read any of the articles in any of the hunting magazines. “I did this; I did that; I went there; I shot that.” Professionals know that they are a set of eyes and a pair of ears, and that their job is to see and do in place of the reader and describe it. Read Jack O’Connor and see how little he intrudes into his own narrative. If you can’t see this, don’t write.