Take a look at the two images above. One is a screen grab from the video and the other is the finished still photo taken with the camera. The top one is much flatter, especially on the face because the main light is coming from behind the subject to camera right. In the final image, we’re getting a warm light coming from 180-degrees off of the main light source, which—at least to my eye—suggests a reflector, or even another light, is in use. You can also see the catch light in the eyes coming from above and camera left. This also helps to keep those brightly-lit sheep from blowing out in the background when trying to get a good exposure on the face. The longer lens and fake blur offered by Portrait Mode having nothing to do with those things.