Very good renders.
The drapery in the 3rd image is open in too wide of folds. Tighten them up, they look like they are made from a very stiff material, and they should look airy and light to soften the room.
The pillows in the 3rd shot are some of the best I have seen.
The 4th shot only looks "off" like davide P said, because your camera ratio is so wild. Trim off the top and a little of the bottom to bring the image into a 3:4 ratio to get rid of the distracting distortion.
Good job on the materials and lighting, they look very convincing.