Joel, Lots have been said about HA on this forum. I believe that Arthur Morris has correctly explained HA down to the percentage point correctly.
my perspective is eye contact with the subject of the photo and the viewer of the photo is of prime importants. The eye contact will give the viewer a feeling (an emotional response) to the photo. HA directions in this forum are an attempt to get you to achieve this emotional response in your photography. Please study forum participant Jan Wegener's two photos of a lesser Scaulp on a previous discussion on HA in this forum. Jan's photos aptly demonstrate this point.
Your GBH capture is very good, but the forum would be negligent not to point out those things that could make your capture GREAT.

Rob...........