Mecha Girl Standing in an Abandoned Sea City

A mecha girl in her mid-teens, pale skin smudged with soot and sea spray, sharp amber eyes reflecting a glowing HUD targeting reticle; waist-length ash-white hair tied in a high ponytail whipping freely in the sea wind. Matte gunmetal exoskeleton armor covers her shoulders, forearms and shins, hydraulic pistons exposed at the joints, and her chest rig carries glowing cyan coolant lines. An oil-stained oversized hangar jacket slips halfway off one shoulder, a massive railgun rests on her right shoulder, and dog tags and a frayed red ribbon hang at her collar.
She stands slightly off-center to the left, on the rusted edge of a tilted steel platform jutting out over black water; her weight on one leg, left hand gripping the cannon strap, head turned slightly toward the camera with a calm, defiant stare. Steam vents continuously from her back thrusters, her ponytail and jacket streaming wildly to one side in the briny wind.
The background is a vast derelict sea city at dusk, colossal megastructures of unknown purpose rising out of the ocean in staggered silhouettes; bone-white monolithic towers fused with barnacle-crusted steel, enormous ring-shaped constructs canted at broken angles, rusted skeletal gantries threaded with dead cables, dark swells rolling between the pylons, several shipwrecks half-swallowed at their feet. Thick sea fog clings to the bases while the towering structures pierce a bruised sky, faint lights blinking here and there high in the towers like distant eyes.
The image uses moody low-key lighting: cold teal ambient light from the overcast sky, a warm amber sodium glow leaking from a distant structure on the right, hard backlight from a low sun behind the towers carving out her silhouette; volumetric rays cut through the sea mist and wet specular highlights sit on her armor.
The camera uses a 35mm anamorphic lens at a slightly low angle, looking past her shoulder toward the distant structures; a medium-wide composition with shallow depth of field that softens the rusted foreground, horizontal lens flares, and fine atmospheric haze compressing the far megastructures into layered silhouettes.
Overall a cinematic anime key-visual style, painterly digital illustration with crisp line art, a desaturated oceanic palette led by teal, bone white and rust with a few warm accent lights; add film grain for a high-contrast editorial poster quality. Frame ratio 16:9.