OK so I agree with a lot of the advice here: Curtains- keep them simple, eyelets, plain fabric, hung straight to the floor, with no swags or anything fussy. Choose any colour......I actually liked the earlier mentioned green but for a feminine feel choose a flower colour for accents in cushions, lamps, rugs, pictures and ornaments. The wall where you have your sofa currently is crying out for something big and tall to match the proportions of your window. Personally I would get a sideboard then fill the wall with either: several matching framed pictures or mirrors, or hang a rug like a tapestry or I would buy a wall mural and frame it with panelling. Alternatively you could wallpaper that as a feature wall. Scale (those are big windows so other things also have to be big, especially on the wall). Pattern and texture: think soft furnishings. Lighting- table lights, a chandelier, perhaps an LED wall washer. Try unusual positioning of lights- under the stairs, behind the sofa and behind the mezzanine. Furniture placement- try to have a feeling of a separate living space - this can be achieved with anchoring it all to a large rug that goes under most of the furniture. Move your exiting sofa in front of the window and move the TV under the mezzanine. Then add a couple of chairs, flanking the TV so that you have a sociable area without obstructing the path to the stairs.

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Hi Ankur Do you mean window dressing i.e. curtains or binds or do you mean the actual window? Do you have a photo of your current bedroom window? thanks

Yes it is the only one and we no longer have a connecting door into the en suite. I dread the thought of having to go back for permission for a skylight even though it is a bungalow. I do wonder if the building control officer will pick up on it.