For Your indoor Pool, My Design proposal is simple, Modern and Comfortable.
The use of White walls makes the space appear larger. One of the long walls will be finished with stones; the stone finishing also extends to the exterior wall in the courtyard for that flow.
I introduced a step between the floor levels in the indoor pool.
There is a seating area at the short end of the indoor pool on that elevated level.
I introduced a new walkway in the pool along the short side close to the Large French window, this is optional but I Strongly Recommend to enhance Movement.
In between the first two existing columns from the French windows is where I propose the Prefab Sauna. The separate shower and toilet will be in between the last two existing columns.
For The courtyard, I tried to create a Green Theme.
I propose a Pergola just outside the Kitchen doors to cover the Dining. It may be covered with glass or plants or just left open.
The large empty wall adjacent to the kitchen French doors will be decorated with creeping plants (wall Ivy).
There is a wall fountain on the wall just opposite of the kitchen doors. There will be flower vases around the courtyard.
Thank you for this opportunity, I hope you like my design.