It would be helpful if you would show the larger floorplan around these spaces. That will provide context and potentially additional solutions. Can you post the layout of the whole floor?

Thanks (and beautiful bathroom!) @cpartist, that looks like the same Daltile cove base tiles we're planning to use (with B&W Tile green subway tiles since no one else makes jade green anymore, apparently!) Heritage Tile does but then you'll pay for it. Also there are other brands that carry green tile. However most companies that do make green tile are a heck of a lot more expensive than what I paid for my white subway tile. I know because I did look into possibly doing a color in the guest bath. Wasn't worth it to me! Does the Daltile black work decently with the Heritage tile black? The Heritage floor tile is a flat black and the white is slightly less white but it all works beautifully together and looks authentic. Even though my house is brand new, I was going for an authentic look of a house from 1910-1925 period. So yes, just like it would have one century ago. And is your trim 1/2" pencil liner? (I ordered 1/4" liner from B&W but still wonder if we should have just stuck with the 1/2" Daltile so that it would match the trim...oh, well!) Yes my trim is the 1/2" pencil liner. And I absolutely would have stuck with the same color liner as your trim color. Blacks from different companies can wind up being different, just as whites or any other color can. BTW: Signature Hardware makes glass pulls and knobs in a jade green color. I used Platinum grout color for my bathroom. I wanted a tint of gray but not so dark as to take away from the tiles.

All safe after earthquake. I misread your drawing. You have lots of space. I would turn the vanity so that the sinks are opposite the entry. No windows were shown, so I am assuming this is a windowless bathroom -- can you add a solartube for natural light? I am not a fan of putting the toilet in a closet -- makes me feel claustrophobic. I am attaching a proposed plan. Enclosing the toilet will make the room feel less spacious. Consider an etched glass panel to "hide" the toilet space.

We renovated recently and removed an old cast iron tub that had been reglazed badly several times - it was tough for our plumbing team to find someone to cut it up and get it down the narrow stairs.. we opted for an acrylic model for our replacement, I absolutely love old things too but definitely appreciate the new pipes that our team was able to run to the new bath as well as a nice level subfloor 😅