docs: def add_picture(self, p):
          """
          needs to look like this (under draw:page)
  
  	<draw:frame draw:style-name="gr2" draw:text-style-name="P2" draw:layer="layout" svg:width="19.589cm" svg:height="13.402cm" svg:x="3.906cm" svg:y="4.378cm">
  	  <draw:image xlink:href="Pictures/10000201000002F800000208188B22AE.png" xlink:type="simple" xlink:show="embed" xlink:actuate="onLoad">
  	    <text:p text:style-name="P1"/>
  	  </draw:image>
  	</draw:frame>
          """
          # pictures should be added the the draw:frame element
          self.pic_frame = PictureFrame(self, p)
          self.pic_frame.add_node(
              "draw:image",
              attrib={
                  "xlink:href": "Pictures/" + p.internal_name,
                  "xlink:type": "simple",
                  "xlink:show": "embed",
                  "xlink:actuate": "onLoad",
              },
          )
          self._preso._pictures.append(p)
          node = self.pic_frame.get_node()
          self._page.append(node)