Would you be prepared to give up the shower for a tub and shower? For the next five years it might be useful.You could remove the sink and shower and place the bath along that wall (with the shower fixture where it is)Hard to see space but could you fit a small sink in front of the window or next to where the shower was (again hard to tell your dimensions).....?

Here are some ideas. I hope you like them!

How big is the window? Why does it need protecting, exactly? What's in the bathroom now?

Your room looks large and lovely but with an entrance at one end and a fireplace at the other can seem a bit long. Firstly take EVERYTHING out. This will show the room in the best advantage and get rid of clutter. Only put back things you absolutely love. I would put two sofas or a sofa and two chairs (they don't have to be a suite) in front of the fireplace OR get a solid coloured L shaped sofa as it seems you are orienting the room toward the TV. You could then put a nice rug under a light-feeling coffee table (maybe glass and wood to pick up your chimney breast) in the middle. This would allow you to get rid of the multiple small side tables. I would lighten up the alcoves alongside the fireplace, either paint or light wallpaper. Get a proper piece of furniture for the TV to stand on. TV stands are ugly. There's lots to choose from. Try IKEA. Take down the heavy curtains and put in Roman blinds in a print fabric you love (try to find one with at least 3 colours) and coordinate with your rug. You could then use colours in this to make/pick throws and pillows. At the end near the door you could put in a small table and your rocking chair and make it like a separate area for music or reading with a nice standing lamp. Get some inexpensive drum light shades to update the lighting and put in another standing lamp by your sofa, as mentioned above, and lower your pictures to eye height. Good luck!