The vase and flowers does come across as the subject of the piece. Which probably cost you some points. Curtains are completely blown out at the right of the picture, losing all detail. Since the rest of the picture is darker in comparison, the eye keeps going to the featureless white space.
The rest of the room is a little dark for my taste, but the colors, focus, depth of field, are all very good. I really like the lighting of the vase, and its contrast to the surroundings.