While I like the ceiling of this building, my favorite part of your photo is the reflected colors on the interior right wall. I pretty much ignore the rest of the image because that one area is so interesting with its lines, shapes and colors.
I like the colors and general composition of this shot. What I dont like is how dark the shadows are on the bottom. Most of the detail is lost (at least on my monitor - and mine tends to be a bit on the bright side). More light down there in PP could have made this a stronger image IMO. But a good find and good fit for the challenge.