It was an exercise in traditional classic glass painting (grisaille) and burning. 4 months work.
Unfortunately the paintwork in the "tower" did not work out well when observing it in the bright sunlight: they are too light. The drapes are better, also a bit on the light side, but still OK. All this looked far better on the lightbox.
But the exercise was about finding out how medieval artists painted those beautiful drapes that you see all over the church windows. In that view this window was successful: I found out how to do it.