Nice. Is it enough drawer storage right at the vanity for the both of you?

No plans to fix the window?

@PPF. What do you mean? Fix what about the window?

This. It looks like an oops, or like the window should be moved or removed. If this were new construction, you would never see a window placed like this.

How long is the vanity you have planned? How many inches have you alloted for the toilet?

Answering your question about the pony wall. it give a small sense of privacy to the toilet. I feel that it looks a little tall in the diagram though. I do agree the window looks awkward, but so what? If you are good with it, we are!

The window looks like a mistake because the high cabinet is "notched" around it with a pretty unusable sliver of a counter. If the high cabinet wasn't there, and even the shower wall was glass, it wouldn't look compromised and the room would feel bigger too.

The pony wall does gove nice separation. And a place to set a phone or something off the counter, if it might otherwise get wet.

For the little nook, could the tall cabinet be shallow cabinets all the way across, above a standard or same-depth base?

Our bathroom has a pony wall, then it steps back to a full-height wall. Nice separation, and allows for a medicine cabinet on the vanity side.

Thank you all so much for the comments and suggestions - super helpful! I'm thinking I will get rid of the upper cabinets and just have the lower ones, and see if I can have just a glass panel for that side of the shower. It seems like if I do this, maybe it'd also look better to get rid of the pony wall next to the toilet as that might look out of place with the other barrier gone (between shower and cabinets). Agree?

The pony wall is a nice finish to the end of the vanity. You know how exposed the toilet feels-does the pony wall solve a problem?

Really, the window is key here. It appears the line in the drawing between windows could have been a wall you are taking out, so the first thing I would ask is are the windows the exact same, or different sizes and styles. Same = keep can be ok, different = remove one, or redo into a single larger or mulled or etc.

Usually, dimensions on a 2D floor plan and more info is given for pertinent advice. I will assume it is a 72" vanity and 32" toilet space, which makes the shower look like 60" including a bench. In general a shower should be a bit larger when having a built-in bench.

I'd look into moving the toilet to next to the shower. Without dimensions, it is hard to tell if another layout may also work.

With the toilet moved, you can do a pony wall next to the shower , which will allow light into the shower.

With a longer vanity, you can do more drawers.

Removing the upper cabinets and opening the shower side does not automatically mean the toilet pony wall has to go. I would test that wall separately with a cardboard mockup: look from the doorway and from the vanity, then compare how much screening it actually provides at different heights. Include the finished cap thickness and overhang, since those affect how the end of the vanity feels in use.

Before giving up the upper storage, list what needs to stay within reach at the sink and check it against the actual drawer interiors. A mirrored cabinet could be another option if the wall construction and door clearance allow it. Draw its open door alongside the faucet, adjacent wall and light fixtures before choosing the size. That way the more open layout still has a workable home for the everyday items.

Thank you thank you everyone - so helpful! You are correct that we are removing a wall and the windows unfortunately are not identical. They are the same style and both start at the same point at the top, but one of them is a couple of inches longer than the other. How bad will that look? I imagine removing a window is quite costly and would prefer to avoid that if we can.

What is your exterior? Would it be easy to patch? Get more siding, faces neighbors so you don't see a potantial mis-match? Could you either replace smaller window to match larger or as I believe has been suggested, make them into one larger window? This may give enough siding material to make a patch that can't be detected.