What about one closet taking up the top part of the diagram? I can’t think of anything besides a makeup vanity to go in the bay window. And moving the door down is going to limit what can go on that south wall. Why is it you want to do that?

Well it's hard to figure lighting if drawings aren't accurate or noted well, and when plans aren't thought out well enough, but "just adequate," I often hear "it's too difficult to change that now," but continuing with all that money and human capital (stress, choosing, scheduling, installing tile, etc etc) eventually leads to regret in "should've done it another way when I had the chance." But maybe you have the perfect layout, so then . . . Because you have the shower and toilet wing walls creating "darkness," I would consider the vanity lighting as part of the main lighting, on the same switch. So the vanity, shower can, and can in front of the shower all switched together. The location of vanity depends. Standard toekick, furniture style, or floating? You will have 2.5' of extra space to either fill or make symmetrical. What kind of lighting and feel of the space do you want? Sconces? Over-vanity style (hollywood lights lol)? General throw of 6" or 4" cans or tighter cones of 3" trims? Ductwork/piping in joist spaces and ceiling height? Dark matte/bright white glossy tile everywhere? That all makes a difference on how many/where.

I would not want the shower half in front of a window, nor the toilet.

"Less frustrating" is in the eye of the beholder. My frustration may not be yours, and vice versa. The simplest thing to do is cover the glass door with a sheer fabric which blocks vision but still allows light. There's no inexpensive solution to the bath problem. As for the closet, it's not a walk-in at all. I would treat it as a regular closet and maximize the opening from the bedroom, maybe put some shelves at the end overlapping the office.