I've noticed a few people wondering why their customers are leaving unhappy (broken heart) after already going into a changeroom/looking at a mirror, and I think I figured out the reason why.

I'm not sure if it's intended behaviour, but its seems a bit strange to me.

If your shop is configured like this, and you have sufficient numbers of mirrors/changerooms, your customers will always leave happy (love heart):
Spoiler: show


However if your shop is configured like this, and you have sufficient numbers of mirrors/changerooms, around half your customers will leave AFTER using a changeroom/mirror UNHAPPY (broken heart):
Spoiler: show


It seems like blocking the sales girl inside one square makes the behaviour of the customers go bonkers, and they become unhappy even after using a changeroom/mirror. Maybe the sales girl is upset at being stuck at work? :P

Again, not sure if it's a bug but it might help people who were confused when this was happening to me anyways.