Hello everyone,
Awesome pictures indeed. 🙂 As for the display, my bintan males for example usually start with by the book head down position but then they twist just anyhow to show themselves in front of the female. It seems to me that it is very dependent on where most of the light comes from and they twist in a such a way that they could use the light when the female is changing position or direction versus them. Even the head down position is always deflected couple degrees from the females position more or less so that the colors are reflected from the best angle. At least it seems to be that way.