code: @Override
      public DescribeImagesResult describeImages(DescribeImagesRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeImages(request);
      }
docs: <p>
  Retrieves a list that describes one or more specified images, if the image names or image ARNs are provided.
  Otherwise, all images in the account are described.
  </p>
  
  @param describeImagesRequest
  @return Result of the DescribeImages operation returned by the service.
  @throws InvalidParameterCombinationException
  Indicates an incorrect combination of parameters, or a missing parameter.
  @throws ResourceNotFoundException
  The specified resource was not found.
  @sample AmazonAppStream.DescribeImages
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/appstream-2016-12-01/DescribeImages" target="_top">AWS API
  Documentation</a>