Hiroshi Nagai style reference and prompts

Crisp retro illustration built from geometric silhouettes, long centered perspective, and large nearly flat color fields. Saturated cyan and teal oppose violet-pink, with luminous white shapes used sparingly for relief. Repeated rounded forms and a few needle-like verticals establish visual rhythm. Fine grain within otherwise smooth areas suggests print texture. Clear high light casts simple decisive shadows, giving the composition polished calm and an idealized, dreamlike atmosphere.

A square, cleanly composed illustration looks down a broad city avenue lined on both sides with densely blooming pink trees. The road narrows toward a distant vanishing point, where low blue rooftops and a cluster of pale modern towers rise beyond the rows of trees. Three very tall, dark, needle-like trees pierce the left side of the sky and add vertical contrast to the rounded flowering canopies. A small pale moon or bright disk hangs above sculpted white cumulus clouds. Parked vehicles and simple street details sit beneath the trees, but the strong rhythm of trunks, pink crowns, and converging road edges carries the image. The sky is a saturated clear cyan-blue, set against deep teal shadows, violet-pink foliage, pale concrete, and crisp white cloud shapes. Architecture and trees are drawn with precise geometric silhouettes and nearly flat color areas, while tiny granular marks give the foliage a slightly printed texture. Sunlight is bright and high, producing decisive shadow blocks rather than soft atmospheric haze. The perspective is centered and orderly, yet the unreal density of blossoms makes the city feel dreamlike. The overall frame has the polished stillness of a retro travel illustration, using large color masses and carefully spaced verticals to create a serene, idealized urban vista.