Sleeping Girl in Pitch-Black Room

Create a vertical anime-style illustration of a young woman sleeping peacefully on a bed in an almost pitch-black room. The scene is viewed from a slightly elevated diagonal angle, showing her full body curled on her side across rumpled white sheets. She has hair_color medium-long hair tied loosely in a low ponytail with loose bangs framing her face, closed eyes, soft eyelashes, and a relaxed sleepy expression with slightly parted lips. She wears pajama_color long-sleeve button-up pajamas with white piping, a small chest pocket, and matching loose pants; her bare feet are visible near the bottom of the frame. A thick white blanket is draped over her waist and legs, catching cool blue shadows. Behind her are exactly 3 visible pink pillows: one large pillow behind her head, one large pillow to the right, and one smaller partially visible pillow farther right. The bed has white wrinkled sheets with pale blue-gray shadows and a few pink areas at the edges. The background beyond the bed is a flat deep black wall or darkness, emphasizing the bed as the only illuminated area. Use dramatic low-key lighting with soft highlights on the bedding and face, strong black negative space, subtle blue-gray shading, and a hand-drawn modern anime illustration style with clean ink lines, painterly crosshatching, muted pastel colors, realistic folds, and a quiet intimate nighttime mood. Add a small handwritten artist signature reading signature_text in the lower right corner. No extra furniture, no windows, no lamps, no text other than the signature.