diff --git a/system_tests/data/faces.jpg b/system_tests/data/faces.jpg
new file mode 100644
index 000000000000..af26c6e3f334
Binary files /dev/null and b/system_tests/data/faces.jpg differ
diff --git a/system_tests/vision.py b/system_tests/vision.py
index 258f67c8f890..d783994b78d7 100644
--- a/system_tests/vision.py
+++ b/system_tests/vision.py
@@ -28,6 +28,7 @@
 
 _SYS_TESTS_DIR = os.path.abspath(os.path.dirname(__file__))
 LOGO_FILE = os.path.join(_SYS_TESTS_DIR, 'data', 'logo.png')
+FACE_FILE = os.path.join(_SYS_TESTS_DIR, 'data', 'faces.jpg')
 
 
 class Config(object):
@@ -53,7 +54,7 @@ def tearDownModule():
     bucket_retry(Config.TEST_BUCKET.delete)(force=True)
 
 
-class TestVisionClient(unittest.TestCase):
+class TestVisionClientLogo(unittest.TestCase):
     def setUp(self):
         self.to_delete_by_case = []
 
@@ -108,3 +109,109 @@ def test_detect_logos_gcs(self):
         self.assertEqual(len(logos), 1)
         logo = logos[0]
         self._assert_logo(logo)
+
+
+class TestVisionClientFace(unittest.TestCase):
+    def setUp(self):
+        self.to_delete_by_case = []
+
+    def tearDown(self):
+        for value in self.to_delete_by_case:
+            value.delete()
+
+    def _assert_coordinate(self, coordinate):
+        if coordinate is None:
+            return
+        self.assertIsInstance(coordinate, (int, float))
+        self.assertGreater(abs(coordinate), 0.0)
+
+    def _assert_likelihood(self, likelihood):
+        from google.cloud.vision.likelihood import Likelihood
+
+        levels = [Likelihood.UNKNOWN, Likelihood.VERY_LIKELY,
+                  Likelihood.UNLIKELY, Likelihood.POSSIBLE, Likelihood.LIKELY,
+                  Likelihood.VERY_UNLIKELY]
+        self.assertIn(likelihood, levels)
+
+    def _assert_landmarks(self, landmarks):
+        from google.cloud.vision.face import Landmark
+        from google.cloud.vision.face import LandmarkTypes
+        from google.cloud.vision.face import Position
+
+        for landmark in LandmarkTypes:
+            if landmark is not LandmarkTypes.UNKNOWN_LANDMARK:
+                feature = getattr(landmarks, landmark.value.lower())
+                self.assertIsInstance(feature, Landmark)
+                self.assertIsInstance(feature.position, Position)
+                self._assert_coordinate(feature.position.x_coordinate)
+                self._assert_coordinate(feature.position.y_coordinate)
+                self._assert_coordinate(feature.position.z_coordinate)
+
+    def _assert_face(self, face):
+        from google.cloud.vision.face import Bounds
+        from google.cloud.vision.face import FDBounds
+        from google.cloud.vision.face import Face
+        from google.cloud.vision.face import Landmarks
+        from google.cloud.vision.geometry import Vertex
+
+        self.assertIsInstance(face, Face)
+        self.assertGreater(face.detection_confidence, 0.0)
+        self._assert_likelihood(face.anger)
+        self._assert_likelihood(face.joy)
+        self._assert_likelihood(face.sorrow)
+        self._assert_likelihood(face.surprise)
+        self._assert_likelihood(face.image_properties.blurred)
+        self._assert_likelihood(face.image_properties.underexposed)
+        self._assert_likelihood(face.headwear)
+        self.assertNotEqual(face.angles.roll, 0.0)
+        self.assertNotEqual(face.angles.pan, 0.0)
+        self.assertNotEqual(face.angles.tilt, 0.0)
+
+        self.assertIsInstance(face.bounds, Bounds)
+        for vertex in face.bounds.vertices:
+            self.assertIsInstance(vertex, Vertex)
+            self._assert_coordinate(vertex.x_coordinate)
+            self._assert_coordinate(vertex.y_coordinate)
+
+        self.assertIsInstance(face.fd_bounds, FDBounds)
+        for vertex in face.fd_bounds.vertices:
+            self.assertIsInstance(vertex, Vertex)
+            self._assert_coordinate(vertex.x_coordinate)
+            self._assert_coordinate(vertex.y_coordinate)
+
+        self.assertIsInstance(face.landmarks, Landmarks)
+        self._assert_landmarks(face.landmarks)
+
+    def test_detect_faces_content(self):
+        client = Config.CLIENT
+        with open(FACE_FILE, 'rb') as image_file:
+            image = client.image(content=image_file.read())
+        faces = image.detect_faces()
+        self.assertEqual(len(faces), 5)
+        for face in faces:
+            self._assert_face(face)
+
+    def test_detect_faces_gcs(self):
+        bucket_name = Config.TEST_BUCKET.name
+        blob_name = 'faces.jpg'
+        blob = Config.TEST_BUCKET.blob(blob_name)
+        self.to_delete_by_case.append(blob)  # Clean-up.
+        with open(FACE_FILE, 'rb') as file_obj:
+            blob.upload_from_file(file_obj)
+
+        source_uri = 'gs://%s/%s' % (bucket_name, blob_name)
+
+        client = Config.CLIENT
+        image = client.image(source_uri=source_uri)
+        faces = image.detect_faces()
+        self.assertEqual(len(faces), 5)
+        for face in faces:
+            self._assert_face(face)
+
+    def test_detect_faces_filename(self):
+        client = Config.CLIENT
+        image = client.image(filename=FACE_FILE)
+        faces = image.detect_faces()
+        self.assertEqual(len(faces), 5)
+        for face in faces:
+            self._assert_face(face)