I disagree with a tub in the middle. That is a disruptive flow and not practical. Jmo

Seems like there are lots of 'wasted' space in the double vanity area.

I think combining the wet areas are a great idea. You might consider placing the tub more to the enter of the wall instead of off to one end. You might even consider a free standing tub. I agree there seems to be alot of waste space opposite of the vanities and you might consider floor to ceiling storage cabinets in that area. I might also suggest you change the door swing into the master bathroom so that it can rest up against the new storage cabinets. Also, you mentioned arches between the rooms and is that something that is common to the architectural details in your home,,,,,meaning,,,,,has that been used elsewhere? Is there a door or pocket door adjacent to the vanity to enter the WC? Have a blast.

Thank you all for the comments. As you can see that there are already conflicted opinion as to the placement of the tub and that is the very reason that makes my dilemma.

I agreed that the tub in the center of the back wall where the window is will create a focal point or wow factor upon entering the bathroom. However that leaves where the sink is now the only viable place for the shower, and that will inevitably obstruct and make the room feel small upon entering and compromise the wow factor.

For this arrangement, indeed there seems to be wasted space, yet the suggestion of floor to ceiling cabinet opposite the vanity will mitigate that. And yes the tub will be better served by placing it center on that side wall, it was careless on my part to place it where it is now.

As for the arch way into the wet area, that is indeed used somewhere else in the architecture, it will be a Spanish style home and I am considering using slightly arched door for all interior doors. There will be an arch way from which the bedroom enter through into the bath room entry area as well. I could also use a slightly arched French door to enter the vanity area and the closet opposite it. This way the entry area may seem coherent. Yet another concern is whether I should downplay the archness a little.

Are you sure you want to have to walk out of the water closet into the hallway to open a door to wash you hands? How about sinks on the opposite wall, toilet moved up so entry is thru where you show sinks now, do the arch idea over the shower(facing tub) leave wall open on tub side to showcase it?

Just remember that arches are great.......however the line pattern brings the eye downward so lessen the arch to more of a segmental arch. Sounds like you have a great direction. I really think if you can keep the window at the end of the room very interesting how it is treated, or the scale of the window, or how the window is detailed out it can be a lovely focal point when you look towards the wet area. Take Care

Yes Pspicer, I had in mind a small corner sink for the water closet to solve the washing hand problem.

In fact I had a new idea derived from the attached Houzz photo. My bathroom is about the same width as the Houzz one but less deep. Will this work? Is 4x6 a large area for the tub with some finishing around it?