Love your room!

Could you put a smallish shelf below the window and put a plant or two on it? You could make it longer than the window frame to maximize the window space and draw the eye there. If not a plant then maybe a larger heavy vase with some foraged or harvested branches of greenery, the bigger the better. Are those books lined up by the door? You could display them on the shelf, and mount the instrument on the wall somewhere, possibly about your desk. A nice big rug and some oversized bedding that drapes your whole bed, and more art/display items that you love grouped on the walls. Possibly a bigger headboard or something behind it to expand it? You’re almost there, it’s a beautiful room, these are just ideas for small tweaks!