A good metaphor for making presentations is good teaching. Teachers seek to explain content and thinking; and to present that material with credibility, with authority, and without patronizing authoritarianism. Here is an excellent paper by the great statistician Frederick Mosteller on teaching.
Frederick Mosteller, "Classroom and Platform Performance", The American Statistician, February 1980, Vol. 34, No.1, pp. 11-17. Reprinted with permission from The American Statistician. Copyright 1980 by the American Statistical Association. All rights reserved.