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[Subject]
A colossal fantasy merman prince rising from the river in front of a nighttime Shanghai skyline, with long lavender hair, pale luminous skin, delicate gold hair ornaments, subtle bioluminescent markings across the torso, and an iridescent lavender tail fin emerging from the water. The figure has an elegant, calm expression and a regal mythic presence rather than an aggressive monster stance.

[Environment]
A dense modern Shanghai waterfront at night with brightly lit skyscrapers, the Oriental Pearl Tower, the Shanghai Tower, reflective river water, and layered city buildings in the foreground, creating a fusion of mythic sea fantasy and hyper-urban megacity spectacle.

[Composition/Camera]
Vertical poster layout, giant character centered behind the skyline, upper torso and head dominating the top half of the frame, translucent tail cresting from the river in the lower center, city towers layered across the body for dramatic scale, balanced landmark placement to keep the skyline readable.

[Lighting]
Cool blue-violet night illumination, strong city-light sparkle, soft moonlit skin highlights, glowing bioluminescent accents on the body, reflective water shimmer, crisp high-contrast skyline lighting against a dark night sky.

[Style/Rendering]
Epic fantasy key art, polished game-poster realism, romantic mythic character design fused with urban landmark illustration, glossy high-detail rendering, elegant magical atmosphere, clean cinematic compositing with strong neon-night color harmony.

[Detail constraints]
Keep the skyline recognizable as Shanghai, preserve the Oriental Pearl Tower and supertall glass towers, maintain the merman’s graceful facial features and long flowing hair, render the tail as translucent and luminous rather than heavy fish scales, keep the water reflections crisp, avoid cluttered extra creatures or boats, preserve a majestic calm tone.

Negative prompt
low-resolution skyline, distorted landmarks, bad anatomy, warped face, extra limbs, muddy tail texture, dull water reflections, daylight sky, cartoon rendering, cluttered harbor traffic, broken perspective, oversaturated neon, monster snarl, duplicated buildings

Suggested parameters
model: SDXL or equivalent, cfg 6.5-8, steps 30-40, aspect ratio 9:16 or 2:3, high-detail character rendering, night-city contrast, luminous water effects, polished fantasy key-art finish

Delta prompt strategy
1. Shift the palette from violet-blue to emerald-cyan for a colder aquatic tone.
2. Replace Shanghai with another iconic skyline while keeping the giant merman-city fusion concept.
3. Reframe closer on the character’s head and shoulders for a more intimate fantasy poster.
4. Increase the water splash and tail motion for a more dynamic emergence scene.
5. Turn the atmosphere toward dawn mist for a softer mythic interpretation.
6. Add rain and storm clouds to create a sea-god cinematic variant.
7. Replace the calm expression with a solemn guardian gaze for stronger city-protector energy.
8. Introduce floating lanterns or magical particles over the river for a more romantic tone.
9. Simplify the skyline and emphasize only two or three major landmarks for cleaner graphic readability.
10. Convert the composition into monochrome silver-blue for a more ethereal underwater-royalty feel.