Floor. Sink. Wall tile w black border. Maybe even glass partition.
Smaller sink but similar size w wood rack below to store towels. Wood to match sauna.
Carry wood paneling motif to other areas of bathroom
Wood color and grain
Layout and lighting.
Lighting. Paneling. Floors
Lighting. Under and above.
Whitewash floor joists and skip finished ceiling
Floor in landing, laundry, bath?
Paneling and finishes make it feel like a proper room, not just a basement.
not this contemporary, but industrial metal shelving with wood planks floating like this. metal can look like pipes.