A reoccurring problem I see among all golfers with their putting stroke is they position their eyes incorrectly at set-up and move their head before striking the ball. An easy way to correct these flaws is to place a small flat mirror on the ground and position a golf ball on it. When you set up with your putter behind the ball your eyes should be over the ball or slightly inside the ball (never outside). Then make your stoke and make sure that your head does not move until after you hit the ball. Your putting stoke will become more consistent and you will hit your putts more solidly. Result – fewer putts and lower scores.