有動機的光線

Use Motivated Lighting: let the existing large left window motivate the lighting. Daylight from that visible window softly lights the window-facing side of the original character and the existing adjacent desk, with illumination falling away across the room toward the right shelves. Keep all resulting highlights and shadows consistent with this same visible source. The hanging lamp remains off; no added equipment or unexplained light direction. Preserve the original patchwork colors and illustration style.