最近很火的Nano Banana新玩法，把图片变成素描画。
提示词：

Create a photo-style line drawing / pencil sketch of the faces identical to the uploaded reference image — keep every facial feature, proportion, and expression exactly the same.

Use black and gray pencil tones with intricate, fine line detailing, drawn on a notebook-page style background.
Show a right hand holding a pen and an eraser near the sketch, as if the artist is still working.