If what you want is to take advantage of the curtain rod you already have, choose a single curtain with loops or rings. Make it on a light fabric in a soft raw or tan toast, which will stand out over the green of the wall and let the light through. A curtain of this type, quite dense, will bring a romantic touch to the room. With the light floor choose a single carpet at the foot of the bed or a round carpet next to the armchair or two on each side of the bed - you will have to weigh the space you have in each area - in a strong toasted tone, so that it stands out without becoming "spots" on the ground since the idea is to create a neutral and very balanced atmosphere. For the ceiling lamp, a design attached to the ceiling. Choose a smooth upholstery for the armchair, but with texture. Try to be a lightweight, low-rise design with a low backrest, so it doesn't saturate the corner where you put it.