use the uploaded image as a locked base do not change layout geometry proportions or placement of any elements this pass is only for final material realism and subtle refinement stone primary refinement refine all stone surfaces to feel like high end natural material light warm gray beige limestone or vein cut travertine introduce very subtle directional movement horizontal or softly linear add gentle tonal variation slightly darker and lighter areas maintain low contrast matte honed finish avoid flat beige appearance blotchy or cloudy texture strong veining repetitive tile pattern stone should feel soft mineral and quietly luxurious fluted wall maintain exact spacing and alignment add subtle depth slightly stronger shadow between flutes very slight natural variation in tone avoid perfect uniformity keep refined and architectural shower niche remove all objects and styling remove any added shelf layers return to a clean minimal recessed niche same stone material integrated and simple side walls tub returns slightly refine edges to feel thinner and more precise reduce visual heaviness keep exact size and position tub floor connection emphasize continuous floor plane ensure no visual separation or platform effect subtle shadow only no base or plinth lighting introduce soft directional natural light from window side create gentle shadow gradients on stone and fluted wall increase depth and realism avoid flat evenly lit look window shade maintain exact proportions add subtle fabric texture and softness to shade keep minimal and clean style no added decor no accessories no staging pure architectural rendering final result a highly refined photorealistic calm modern organic bathroom with soft dimensional stone subtle depth and shadow crisp but natural fluted wall continuous floor minimal elevated atmosphere
