Would you think of swapping the chairs to either side of the window and the sofa facing them on a larger softer more traditional pastel floor rug. I would add some greenery like a parlour Palm to the corner of the room in a traditional styled pot. You house looks just beautiful with all its lovely features. Chairs on an angle plus a coffee table in the middle

paint the end door a striking colour, horizontal stripes on the ceiling, and 3 large pendant lights. not sure how adventurous you are, but you could consider painting different colour "zones"- 3 different colurs as you walk down the passage.....possibly even 3 short carpet runners. i love the idea of wainscoting-but you will lose precious centimetres. You can get paintable wallpaper wainscotting.

You could still go with the beige walls and white panelling and white fretwork as that is what you love, all white is stunning, as you can see by the last photo painting the fretwork beige it loses its beauty , but that’s me, the white makes it looks stunning.

Wow, your hallway definitely needs decorating with colour and texture. The hallway looks around 1500mm wide, so lots of room. I agree add a vertical artwork in wall niche straight ahead. Add a console/hallway table, mirror, plants in rattan pot plant holders. Maybe seating with a narrow bench with textured coloured cushions. Either a colourful hall runner, or a jute hallway runner. Furniture in your favourite design, but not shiny surfaces, you need to add texture and colour.