Are these drawings to scale? Tub looks tiny and shower2 looks to be barely wide enough for a slender person.

You need to check your dimensions.

In the first scheme, the dimensions of shower, aisle and toilet space look questionable.

In the second scheme, the toilet space looks questionable and the shower is unworkable.

18' bowling alley with a double window at the far end? Eh, no thanks.

What's the 5'3" room right next to this bathroom? I'm guessing it's a closet. Could this become part of the bathroom /push the closet to the spot where the toilet and the shower are now? I'm thinking this'd allow you more natural light to permeate the whole room /make the room more compact /more functional.

Yes, I agree that something's off with the proportions of the drawing.

Who drew these schemes--a consumer or a CAD operator?

Neither one is good.

You shouldn't have to walk past the door to wash your hands when finished at the toilet. The path should be enter the bathroom> head to toilet> wash hands on way out of bathroom> leave bathroom.

And you have an 18' long narrow bathroom but two skimpy clothes closets?

Consider this concept without a gas chamber. More windows will make the bathroom be a more pleasant space to be in.

Mark.....WITW would you want a window in the toilet room or in the tub area??

Windows by a tub for views while taking a relaxing soak.

Window by the toilet for quick ventilation.

@robin0919 - We put large windows in our tub area for the view and the light...Tis pretty common. Do you prefer a windowless bathroom?

Windows in the north wall at the tub, in the east wall at the tub, between the sinks, and above the watercloset. Each for view, light, and ventilation to some degree.

When locating and sizing windows, one must consider view out and view in.

Tons of glass options, windows all the way!!

Ok....I was wrong about the window where the tub is for views. It really depends on if it is on the first floor or second. Do you really want a window there on the first floor? BUT.........

' Window by the toilet for quick ventilation. '

You need an elect vent in the toilet room.

I do like windows in the bathrooms, just not in the toilet room.

I do like what Mark posted if it's on the second floor.

I like marks plan. I’d want access to a window somewhere. Can be tricky with a tub in front of the windows. I have to actually climb into my tub to get to the window. Not good but I like all the light. I don’t see a second window on the plan

Unfortunately, like most posts, all the information is not provided sufficient enough to provide proper advice. In the layout I suggested the tub may be flooded with light and have ventilation enough to feel like you are bathing outside, but without a site plan we do not know if the windows face a northerly direction or what floor it is on or if the bleachers are filled and popcorn sold every time you take a bath.

One of the benefits of working with a local architect is that they can gather the information needed to create a proper design without having to extract the needed information like pulling a tooth.

Mark, love " or if the bleachers are filled and popcorn sold every time you take a bath."

I have a friend who won’t shower outside (in a beautifully built shower area) because she is nervous that people in a plane will see her naked! My husband always replies “I wish them good luck”. (tacitly, not worth the effort).

Add doors wherever you like.

Don’t like to add doors.

Too many little spaces and corners.

Never get a wheel chair or walker in and out of there.

I wouldn’t worry about people in planes seeing me naked outside. Drones, though, is another story.