I need a drawing showing windows all measurements clearly marked posted here in jpeg format so we can enlarge the drawing please post here in a comment do not start another post and please use feet and inches this is a US site. Waht size is your bed and waht is the black rectangle on the left wall.

"happy to make the ensuite smaller?"

Please put dimensions to this plan? Take pictures of your existing space and furnishings as well.

We're not clear on anything you've asked....including especially making "smaller ensuite"

Every wall, window on this:

https://www.houzz.com/discussions/6411000/how-to-houzz-how-to-ask-questions-how-to-get-helpful-answers-and-e#28784466

Another option…annex the part of the landing that is beside the ensuite bathroom to include that space in the ensuite bathroom. Install free-standing tub in front of windows with blinds/shutters/blackout shades. If a shower is required add the shower curtain framework or fill in windows and install a tub/shower combo. Here’s the new layout…

On the same lines as Susan suggested, above, claim that bit of the landing alcove for your toilet or sink, and rearrange your bathroom fixtures to accommodate a tub shower combo or a larger shower. I would address your storage needs by creating a wall of ceiling height closets and storage with an inset for your bed on the right wall. The bridge of cabinets above your bed might include down lights, or you could place sconces on the wall behind your bed head. That area could be a nice space for an upholstered headboard filling that space, with the sconces mounted on it. Storage drawers beneath your bed on both sides could provide more space for clothing, etc. A tv could be hung over a very narrow console at the foot of your bed. And I think you might be able to accommodate a small slipper chair in the bottom left corner of the room. Without a measured drawing, of course, we can’t know if any of this is possible.