Don’t keeping looking at yourself in the screen. When talking directly into the camera I would recommend that you centre yourself in the frame and have your eyes placed exactly in the top third of the frame. This will draw the viewers eye towards you and help build the connection you are looking for.
What Sells Best On Shutterstock?
Some types of photos that sell best are Portrait Photography, Food Photography, Landscapes (usually with people) and fine art photography (artsy).