精细钢笔画风格主体提取

{
  "prompt_template": "A detailed ink drawing based on {"image reference" "[insert image reference here]"}, isolating the main subject. Rendered in a traditional micron pen sketchbook style. Shading, texture, and patterns are achieved exclusively through dense cross-hatching and fine line work, using high contrast black ink on textured white paper. The subject is centered with vast negative space, completely removing the original photo's background."
}