Your ceiling is shaped like boards of wood and they don't match the wall, the floor, or the style of the setting so much.
If you look at the previous artist's, the top surface matches the wall in texture and shape fairly closely. It's almost the same wall segments with different highlighting and shadows.
As far as your own work goes the floor, pit, and wall have a pretty solid direction as far as style goes, but the top is pretty barren of detail. It looks unfinished compared to the rest.
Why don't you try using the wall texture on the top as well? Or perhaps giving your top surface some more surface detail to the smooth panels.