I like shooting the square format at times. No, not because it is easier then to decide which side of the picture to crop. Precisely because the composition within a square has to account for this more “static” format. I have noticed, that strong diagonals are often more successful within this formula. Circular compositions are also appearing more natural.
Looking at this picture, I can’t help feeling some tension, between the triangle ( dog, owner, bench) of main subject, and the swirling square of the shop window in the background. The verticals look so strange, because this street has a strong downward inclination. I think, it would have been difficult to combine this with a rectangular crop.