Your headboard is nice but quite large. Try adding larger lamps to balance with the weight of the headboard. On the non window side, put a tall mirror on the end table leaning up against the wall. The mirror should be about the same height as the window. Are you going for an all white theme? If so add some texture such as furry fluffy toss pillows and throws with texture. Alternatively you could add a pop of colour with toss cushions and throws.