code: def get_letter_as_image(self, pixelletter_id):
          
          image_letter = self._make_get_request('letters/previews/{}_1.jpg'.format(pixelletter_id))
  
          if image_letter:
              return image_letter
  
          return None
docs: Get specified letter as image
          :param pixelletter_id: ID of the letter
          :return: JPG-Letter-Unicode-String if successful else None