The follow through should always be a reaction to the momentum of your swing and how much resistance at impact there is. You won’t follow through the same from deep rough as you will from the fairway or the tee. Assuming you are playing a normal shot, you want your weight on your left foot, your belt buckle to the target and your chest facing left of target. To get the feel of this, try some practice swings were you finish this way. When you can do it with regularity, then try some shots where you don’t worry too much about impact. Instead, see if you can make this move on a regular shot and find the same finish! With some practice, this will become second nature.