You've used the light to make a very sensuous texture, almost like cake frosting but not too sweet. I like the Mondrian lines (more than I like Mondrian). The shadow on the window is stunning.
Scanning the thumbs and this jumped out at me. I have trouble calling it a landscape, but I absolutely love the composition. This is the kind of stuff my lens is gravitating toward lately. Really good!
As a photograph I think this could be a little bit sharper. For the challenge I feel like this would be better for a street photography or buildings challenge than landscape.