Shy Pink-Haired Guitarist Anime Portrait

Create a polished anime-style square illustration of {argument name="character name" default="Hitori Gotoh"}, a shy teenage girl with very long straight {argument name="hair color" default="pink"} hair and blue eyes, blushing with a nervous, downcast expression. She stands indoors in a soft pink rehearsal-room or bedroom setting, wearing an oversized {argument name="tracksuit color" default="pink"} zip-up tracksuit jacket with pale sleeve stripes and a black skirt, holding a black single-cut electric guitar with gold hardware, cream binding, humbucker pickups, and a black shoulder strap. Her left hand grips the guitar neck while her right hand is held anxiously near her chest, emphasizing introverted stage fright. The background is a mauve-pink wall with warm sunlight streaming in from the right, casting window-frame shadows and a gentle nostalgic glow. Include exactly 2 wall items on the left: one dark concert poster reading {argument name="poster headline" default="STARRY"} with smaller band-list text beneath it, and one small pink sticky note with handwritten Japanese practice text and a tiny doodle. Add subtle hand-drawn star and heart outlines on the wall, soft bokeh dust, delicate cel shading, glossy hair highlights, detailed guitar reflections, and a high-quality modern anime key-visual finish.