Shy Anime Love Letter Portrait

Create a vertical anime-style close-up portrait of a shy high school girl against a flat vivid {argument name="background color" default="crimson red"} background. She has long glossy {argument name="hair color" default="black"} hair with straight bangs and loose windblown strands framing her face, pale skin, flushed cheeks, half-lidded watery eyes, and a small bashful smile. She wears a dark Japanese sailor school uniform with white collar stripes and a red neckerchief. Center the composition tightly from chest to top of head, with her head slightly tilted and her shoulders relaxed. She holds a white love letter envelope close to her mouth and chest with both hands; the envelope has one small red heart seal in the center. Green flower stems and vines wrap around both wrists like delicate bindings and trail upward across the envelope. Include exactly 5 small purple daisy-like flowers with yellow centers: one at the left edge of the envelope, one near the upper middle, one lower center in front of the envelope, one near her right cheek, and one at the right side of the envelope. The mood should feel romantic, embarrassed, and emotionally intense, as if she is offering a secret confession letter. Use polished Japanese anime illustration rendering, crisp line art, soft skin shading, luminous highlights in the hair, detailed hands, shallow depth of field, high contrast between the red background and cool black uniform, no text, no watermark.