That's actually a very interesting portrait IMO Patrick.
At a quick glance there appears not to be much to note about it. His head and his gaze out the window are the first things that catch your eye and TBH my first impression was that the pose looked stiff and awkward and frankly I thought he looked completely bored.
Then on looking further and exploring the photo, you start to notice the positioning of his feet (and how they look far more animated than the rest of his body) and the tension in his clenched fist. Really made me reevaluate my first impression of stiffness and boredom and start wondering what he was actually looking at / thinking.
It's subtle, but I like subtlety in my portraits sometimes and in this one it really works