The square image (You may have noticed a tread here), seems to have enormous flexibility in portrait framing options. I am not saying that rectangle images do not, but the square seems to allow the rules to be broken.
The normal “looking in” composition horizontal images prefer and portrait orientated images require.
A rule breaking centred figure. Still seems ok in the bias neutral square.
The “looking to the short side” image. Still solid. This can be dramatic with a rectangle is appropriate to the situation/subject, but is usually too strong a statement image for a general portrait.
Ok, let’s try again.
Centred as a compromise between facing and eye direction and balancing the edge elements. The dynamic of the younger woman on the main subjects shoulder is clear.
Slightly more balanced. More about the main subject and nothing else.
More dramatic and tense, but still viable? The introduction of the man on the right changes the feel of the image and the woman almost seems to be cramped, even harassed in this composition.
A benefit or something that a rectangle can do?