'Return a new picture shape added in its own paragraph at the end of
the document. The picture contains the image at
*image_path_or_stream*, scaled based on *width* and *height*. If
neither width nor height is specified, the picture appears at its
native size. If only one is specified, it is used to compute
a scaling factor that is then applied to the unspecified dimension,
preserving the aspect ratio of the image. The native size of the
picture is calculated using the dots-per-inch (dpi) value specified
in the image file, defaulting to 72 dpi if no value is specified, as
is often the case.'

def add_picture(self, image_path_or_stream, width=None, height=None):

    run = self.add_paragraph().add_run()
    return run.add_picture(image_path_or_stream, width, height)
