cases like when the subject to looking or facing left or right, is is better if they are slightly off-center. if a person is looking right, then it looks better if they are positioned slightly to the left in the photo, with more open space to the right in the photo. it works the same for any moving object, if a boat or car is moving to the right, then the boat or car should be slightly more left in the photo with more open space in the direction they are moving, in this case, on the right side of the photo.
as you can see in this photo, when the 