docs: def delete_image(self, image_id):
  
          '''
              method for removing an image from AWS EC2
  
          :param image_id: string with AWS id of instance
          :return: string with AWS response from snapshot delete
          '''
  
          title = '%s.delete_image' % self.__class__.__name__
  
      # validate inputs
          input_fields = {
              'image_id': image_id
          }
          for key, value in input_fields.items():
              object_title = '%s(%s=%s)' % (title, key, str(value))
              self.fields.validate(value, '.%s' % key, object_title)
  
      # report query
          self.iam.printer('Removing image %s from AWS region %s.' % (image_id, self.iam.region_name))
  
      # retrieve state
          old_state = self.check_image_state(image_id)
  
      # discover snapshot id and tags associated with instance id
          image_details = self.read_image(image_id)
          tag_list = image_details['tags']
          snapshot_id = image_details['snapshot_id']
  
      # remove tags from instance
          try:
              delete_kwargs = {
                  'Resources': [ image_id ],
                  'Tags': self.iam.prepare(tag_list)
              }
              self.connection.delete_tags(**delete_kwargs)
              self.iam.printer('Tags have been deleted from %s.' % image_id)
          except:
              raise AWSConnectionError(title)
  
      # deregister image
          try:
              self.connection.deregister_image(
                  ImageId=image_id
              )
          except:
              raise AWSConnectionError(title)
          self.iam.printer('Image %s has been deregistered.' % image_id)
  
      # delete snapshot
          try:
              response = self.connection.delete_snapshot(
                  SnapshotId=snapshot_id
              )
          except:
              raise AWSConnectionError(title)
          self.iam.printer('Snapshot %s associated with image %s has been deleted.' % (snapshot_id, image_id))
  
          return response