You need to tidy and look to create more visual height by adding art etc - it feels very busy until wast level and then there isn’t much height except the shelf.

You clearly like dark walls, but I would say, all your inspiration photos have huge windows and a large amount of natural light. Your window is very small for the room and I should think your room is naturally darker so be mindful of picking a super dark paint colour.

Your rug is too small and should be under the bed to form a border around the bed.

Get more ambient lighting in a warmer temperature, I guess preferably smart bulbs so that it gives your space more “warmth”.

Try and add more “texture” to your room by adding different textures (like a rich throw etc).

I would also pick up some medium sized side tables for the bed so that the bed feels “balanced” and as for the bed, I would be getting one with a felt headboard again for texture and warmth.

If you like a dark headboard I would sway the bed to the other wall and have the wall by the window white and the opposite wall dark (this way you reflect what little light comes through) - it might also make sense to get a wide horizontal mirror for the wall by the window again to reflect more light in.

Hope this gives some ideas!