Thanks Dune!
I just realized that the polyspheres subdivisions show quite clearly here, but I like it as it is. The other kind of sphere di not work at all with the method.
Pixelpusher, that date would be astonishingly recent. Maybe, maybe only a catalog number, what surprised me most was the quality of the render (even before upscaling), because in the earlier smaller versions I simply had not noticed that there was a number at all.
What do you think of the renders beside that?