render a luxurious modern indoor thermal spa with a serene ambient atmosphere include cascading waterfalls under a sleek dark ceiling in contrasting tones of deep brown and soft purple feature vibrant blue water in one pool glowing red water in another pool and then warm orange glowing water in the middle pool creating a calming effect behind the waterfalls illuminate the walls with warm glowing himilayan salt blocks that enhance the mood add seating with elegant gray and white striped cushions interspersed with rich red pillows for a touch of sophistication the floor is textured with a mix of dark gray and subtle stone tones maintain an overall ambiance of tranquility and elegance keep all details the same from original image simply upscale and make the rendering more realistic
