Can the window move?

Move the toilet to another wall besides the bedroom wall. As it is, you'll hear the commode flush through the walls.

What is the 2'-space next to the sinks for?

Can you do something like this? Youre losing the storage cabinet, but gaining storage in the vanity and wc. I’d put a pocket door in wc and clothes closet, and maybe in the bathroom entrance.

Close off the door to the closet in the bathroom and move it into the bedroom. You don't want to be walking thru the bathroom to get to your closet.