Your follow Through should extend past your contact and be the way for your body to finish the momentum your swing has carried. 

 

The follow through should continue along your one plane swing path, and end with the shaft of the club perpendicular to your neck. The most significant part about the follow through is that you don't end your momentum early, and reduce clubhead speed in your contact, as that will reduce yardages as well. 

 

As your clubhead goes on the upswing, it should pull your body up, and wrap around your shoulders to have a forward, balanced finish position. 

 

You should be straight, stomach facing the target, while having nearly all your weight on your lead foot.