If one looks at the Middle left rosette there are similar blue scuff marks.
I think that the shapes containing the blue scuff marks are windows
and the blue scuff marks represent the sky (perhaps to save paint).
As Koen pointed out in post#1,
"Conceptually, we can probably assume this scene takes place either in the sky or in the heavenly realm (or both)."
Then as in the middle left rosette the 'curved dabs of blue paint' could represent the sky.
The detail could be an artistic device to convey the notion that the sky is a canopy
i.e the detail is guy ropes and such like.
Or
I'm just throwing this out there, the detail represents the Milky way.
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