I have read through the comments posted and I'm very amazed at how productive your followers are. Always looking for compromise, would it be possible to to face the two- seater couch toward the three-seater? I know it puts the two-seater back to the kitchen area but it would pull in the living area to one room. The sunroom behind seems to scream do something with me ( if only to make it a kids playroom). One or two chairs of smaller scale might be added to the open end of the couches. Or a low, wide bookcase that would feel like a faux divider and would add storage. Back to back bookcases would add heft and double the storage.

Before replacing your curtains as this can be quite expensive for such a large window, if they are in good condition, add a band of extra fabric to the bottom in what ever suits you, your existing curtain track can then be moved up to the ceiling for good looking full length curtains without the large round eyelets, could save you a lot of money, I would look at replacing/removing the sheers cheers

Thank you everyone, lots of shopping, many shops seen. I have pulled this look together. I am not sure about the heavy textured throw. Just walked in with it, thinking a white pot with a plant in the corner by the window. I wanted to find the beige colour in the blue cushion, a much darker colour than the plain one l found to the left of it. Take care everyone. Sue

In your post you said you were after a provincial look. You could bring in some accent chairs in that style and use throws and cushions in the blue from rug and the red also, to bring together. This is colours as Julie suggested. Visit your local second hand furniture store, they may have furniture pieces you can start with. I find sometimes rooms come together better over time. You will see things that are your style, and this will add to the room. Don't think you have to 'finish' the room straight away. And I agree with other post. Paint is an inexpensive way to change a room.