水彩风日出月夜田野花卉插画素材

Spring Equinox poster background, equal day and night theme, dreamy watercolor illustration style, sunrise and sunset dividing line in the center, sky gradient from pale orange-gold on the left to deep purple-blue on the right, a sun and a moon echoing each other in the sky, hazy fields and distant mountain silhouettes below, willow branches and petals dancing in the wind, watercolor bleed effect, soft transition, poetic atmosphere, negative space composition, suitable for artistic poster background, soft colors