The shower in the middle is a unique touch, I love the color scheme. The accent tile in the shower was a really good touch. A towel warmer was a brilliant add, as who does not love a warm towel right out of the shower. This remodel turned out very well nice job.

Sometimes it goes to brutal truth. There was never anything good in this set up.There won't be a significant improvement, unless you get over the sharing/togetherness aspect !! . I'd steal a foot, who cares, you're sleeping. Add a pocket door, .......and get a decent CLOSET.......seemingly LOST IN ALL THE ABOVE CONCEPTS OTHERWISE? Take bedroom two and get a real primary/owners suite, and give bed four an en suite bath. The house is a sixties/ seventies concept with too much..... stuffed in a too small footprint. Go big, or stay home : ) as the existing set up would never satisfy a future owner in any scenario.......and leaves you with MEH? Or the" kaching" route.The one where you bring in the pro designer and a contractor that pro designer recommends. . Where it is certainly possible to have whatever you want if that is tub, no tub.......etc and nine feet of vanity guaranteed. You consider the neighborhood, your length of stay............budget....all of it. Apologies quickie "art" ........you get the idea

The way you have it laid out, the cabinet feels awkward, However, is this to scale? The only way for me to comment on a cabinet or actually, all of the other featurues is a to-scale layout with measurements marked. If in fact this is to-scale, I say "no: to the cabinet. However, you could add storage all along that toilet wall, it would just be shallower than what you are showing. I don't know how much space you have there. Shallow space is often very functional in a bathroom. (rolled towels and toiletries)

If you have hard water your soap or bath bomb or even just your water , or your water plus your exfoliated skin cells will leave that ring. You can get a an OXO extendable tub and tile scrubber. Or, the modern version and let electrical power do the work and get an extendable cordless chargeable multihead spin scrubber. Amazon sells so many versions. First fill the tub with hot water and throw in Oxi-Clean and let that sit there . Then use the power scrubber. You might change your soap. I have found that liquid (glycerine based) soaps leave less "soap scum" than bar soaps. Or take your showers. The power scrubber works very nicely on tile, too. Just be careful to not go overboard on the grout. Remember when you were learning to brush your teeth and your mom said "You are not scrubbing the floor!"