I think a house plant would look great in that corner, the space is large enough for you to fit a relatively decent sized plant that has some height. Alternatively a few rows of floating shelves to display books, candles, and interesting objects would look nice.

Whilst I prefer the sideboard in front of the window (to avoid the long line of furniture) it would block all the heat and I’m not sure the window is high enough for a console?? I would be tempted to add more of the ochre for curtains and if it’s far enough from the radiator an oversized plant in a woven basket. I’d pull the rug an inch towards the tv and move the far table (in this pic) back and add a table lamp. Perhaps also paint the radiator/s in the wall colour? You could add a textured throw over the arm of the sofa under the window? Perhaps in time replace the footstool with a slim brass/bronze and glass coffee table and add a knitted or fur pouffe at the ”bare” end?

All sensible and helpful comments above. You don't say where you live, but this aesthetic makes me think of Mediterranea countries, or perhaps California/ Florida ? The tiled floor is lovely, and very practical, but the 'vibe' is more of a hotel lobby, so definitely a large rug, and bold wall hanging (suggested above), to create a sense of cosiness. And then - yes, live with it for at least 6 months, when further ideas will occur to you.

Cupboard with access from bedroom like this?https://www.houzz.co.uk/hznb/projects/over-stair-cupboard-pj-vj~1953853 This might not work because of the window position, it depends on the height of the top of the window in relation to the bedroom floor.