This... took my breath away, it's glorious. Absolutely beautiful.
My only critique is, if that design is painted on a flat ceiling, it seems to be missing perspective depth.
It almost looks a floating object in the middle of the room. It would seem too circular for the angle I see it at. Something more oval would better suit, similar to the oval shaped columns just below the Mane6.
All I would do is scale/squish the ceiling design to half it's current height, move to the top of the picture, and extend the vertical lines beneath it to meet the flattened ceiling design.