最近在啃自然界那些看着像被算过一遍的结构，雪鸮的面盘算是最上瘾的一个——从正上方压下去看，羽毛一圈一圈往黑喙上收，规整得像手画不出来的同心矩阵。前面跑了七八版全废在光上：只要给一点方向光，绒羽就冒高光斑，几何感立刻散掉。后来干脆把光压成全漫射的高调，才把那股“天然工程”的味道留下来。
提示词我重新整了一版，比最初那版信息更全，可以直接拿去改：
Top-down minimalist graphic study of a snowy owl's facial disc, shot straight down the axis of symmetry, subject perfectly centered.
The facial feathers radiate outward as an almost mathematically ordered concentric matrix — fine white and silver-grey filaments, ring after ring, all converging on the matte-black beak at the exact center.
Material contrast is the point: the light-drinking velvet nap of the micro-feathers against the razor-clean boundary lines where the plumage fields meet, no stray barbs breaking the geometry.
Lighting: fully diffused high-key illumination from directly above, no speculars, no hot rim, shadowless falloff so the outer silhouette stays pure and clean.
Palette limited to warm white, cool silver-grey and dead black; faint vignette to lock the eye onto the center.
Macro lens look, flattened perspective, generous negative space around the disc, poster-like natural-engineering aesthetic.
负面词我主要压 harsh specular highlights、messy feather strands、visible eyes、tilted angle，视角一歪整张就报废。
