code: def add_image(self, filename, *, width=NoEscape(r'\linewidth'),
                    placement=None):
          
  
          super().add_image(filename, width=width, placement=placement)
docs: Add an image to the subfigure.
  
          Args
          ----
          filename: str
              Filename of the image.
          width: str
              Width of the image in LaTeX terms.
          placement: str
              Placement of the figure, `None` is also accepted.