public com.google.cloud.vision.v1p4beta1.FaceAnnotation.Builder addFaceAnnotationsBuilder() {
      return getFaceAnnotationsFieldBuilder()
          .addBuilder(com.google.cloud.vision.v1p4beta1.FaceAnnotation.getDefaultInstance());
    }
<pre>
If present, face detection has completed successfully.
</pre>

<code>repeated .google.cloud.vision.v1p4beta1.FaceAnnotation face_annotations = 1;</code>
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/AnnotateImageResponse.java