One qualifier I would add is that if someone is significantly taller than you are, then looking straight over their should is not an option....I haven't met that many tall Argentine's and so the average height between partners is often such that finding another head position is not necessary other than that which Janis advises...Unfortuantely, living in America or Europe, there is often a rather large discrepancy in height and so adjustments have to be found. I find the American teachers to be the best ones to approach for this.