Looks like some of them open...it would be cool to get some glass paint and paint the windows to look like stained glass...just pick you favorite colors and go at it

I would get rid of the upright cabinet it is not even the same style or color as the lower cabinet so really don’t work together then get a long shallow glass door cabinet to hang above the base

Are you saying you will be layering a wooden false wall on top of the existing wall to hold the pocket door? If that is the case, you might want to treat the entire side of that new and existing wall ( including the area above doorway) as an accent wall using wood veneer strips. They look like actual pieces of wood plank which have adhesive backing, they come in a variety of finishes and colors...I like the old reclaimed wood look. A diagonal pattern would add extra visual interest, but would be more intense to cut and install. That will camouflage the additional layer and create a beautiful accent wall.

If the shower area is sufficiently big, I would prefer to opt for glass partition as that ensures that outside dry area does not get wet, which may happen in case of shower curtain. Having said that, I would opt for shower curtain if the shower area is small to avoid accidentally banging my elbow against the glass partition while taking shower and getting hurt.