koi ring choreographed vortex

A ring of koi arcs through dark water, choreographing a luminous vortex that suggests tranquil motion and balance. Scales are enamel-like with pearlescent facets, fins sheer and ribboned, surface tension shows glossy ripples and sparse droplets near the core swirl. Depth layering places faint ripple traces in the foreground, the koi ring in the midplane, and a uniform inky pool beyond; focus resides on overlapping heads and dorsal lines; medium DOF holds the ring legible while peripheral water resolves as buttery gradients. Lighting is biolum bands in electric orange, cyan, and rose along lateral lines with subtle caustic shimmer; grading is cool-cinematic with targeted saturation in the vortex center and deep neutrals elsewhere. Environment includes three concentric wake lines, a few suspended bubbles, and a central eddy. Camera is high three-quarter vantage with a normal FOV, centered circular composition, 16:9 crop with symmetrical balance. Style blends long-exposure light-painting aesthetics with Octane-rendered photoreal koi and hand-painted glow passes. Reserve the top ~12% and both bottom corners as protected negative space consisting of soft, low-detail, background-matched areas; confine all luminous and detailed activity to the central field only.