code: def get_user_profile_photos(self, user_id, offset=None, limit=None):
          
          result = apihelper.get_user_profile_photos(self.token, user_id, offset, limit)
          return types.UserProfilePhotos.de_json(result)
docs: Retrieves the user profile photos of the person with 'user_id'
          See https://core.telegram.org/bots/api#getuserprofilephotos
          :param user_id:
          :param offset:
          :param limit:
          :return: API reply.