I think it's cool, but needs some more thought. The first obvious item is how does one understand that the adjoining hallways are "under" the balcony. Perhaps "semi" transparent part of the balcony where the entrance would be. Or perhaps semi transparent the entire balcony. Or have the balcony avoid avoid one of the doors(the right would) and have stars up right outside the door(but that only solves the issue for one door.) shrug... don't know.
You should think about the hand railing since the would not be made that way with board planks. Ditto the columns likely. For the railing, I would suggest adding smaller posts(these would not go to the floor of the room) and have the planks straight and not curved at all. You would have to rotate the texture for each segment though to get it to look right (and/or go with a different approach all together, perhaps wrought iron railing)
Would it be possible to lay down a grid or something else to provide scale for your future images? Oh and BTW, those stairs look awesome!!!