Referring back to the post on face landmark detection, the command to retrieve face landmark information is
fm.fit(im.getBGR(), faces, shapes);
where im.getBGR() is the Mat variable of the input image; faces is the MatOfRect variable (a number of Rect) obtained from the face detection; shapes is the ArrayList<MatOfPoint2f> variable returning the face landmark details for each face detected.
Each face is a MatOfPoint2f value. We can convert it to an array of Point. The array has length 68. Each point in the array corresponds to a face landmark feature point in the face as shown in the below image.