code: def media_image_url(self):
          
          if self.is_nowplaying:
              base = self.server.construct_url(API_URL)
              try:
                  image_id = self.session['NowPlayingItem']['ImageTags']['Thumb']
                  image_type = 'Thumb'
              except KeyError:
                  try:
                      image_id = self.session[
                          'NowPlayingItem']['ImageTags']['Primary']
                      image_type = 'Primary'
                  except KeyError:
                      return None
              url = '{0}/Items/{1}/Images/{2}?width=500&tag={3}&api_key={4}'.format(
                  base, self.media_id, image_type, image_id, self.server.api_key)
              return url
          else:
              return None
docs: Image url of current playing media.