Upload & Sell: Off
I know i've repeated this often but the OP hasn't heard it so regulars forgive me...
I approach composition of my photos and C&C of others by asking what is most important to the story I want to tell, or I think other photographer did. Then I ask myself how can I make it contrast most in the frame so it pulls the view to it and holds them there. The next questions are what if anything to I need them to see before getting to the focal point — foreground or background context to understand the action, or lack of it at focal point. Finally after getting to the focal point do I want the viewer to stay there or wander off and explore the rest of the frame.
The answers to those questions are not the same for all photos it's just a compositional framework like compositing a sentence and making sure it includes a subject noun, a verb, and deciding if adjectives and adverbs are needed and whether they should go before or after.
A conventional H&S looking at camera portrait has a very simple message — I want you to look at me. If the person is looking away or eyes are shaded it sends a different message.
There is a historically conventional way portraits have been composed since the were drawn on walls of caves. The face is on top above the shoulders. We are so conditioned to that convention that perception studies where eye tracking is used showed people shown a photo will automatically track where they would expect to see the face as a way to see if there is in fact a face in the photo. Not all the time, but enough of the time in enough different photos that the psychologists considered it statistically significant.
So part of what happens for me, and I would suspect other is that the fact this photo isn't composed conventionally creates a "Hmm... this is different" emotional reaction when the face is finally found on the far right. All of this is subliminal and instantaneous but it is what will trigger the next thought "What the hell is he doing over there?"
This is where the photo = 1,000 words kicks into gear. There is no caption or backstory so you brain and mine make one up. Your will be different than mine because your life experience is different. For all I know the Dude is your cousin. You brain processes the clues — hat, shirt — and decides what he's about. Then your eye wanders off the face again.
In that context to the OP I'd ask, what's the story you wanted to tell here with the unconventional crop? Was it an expression about the subject, or more one of "gee it would be more creative if I did something unconventional". I'm not making a value judgement about that — I've established I think its a great portrait — it's more food for thought about his growth as a photographer who knows how to have the viewers react in the way that is intended. To me that one measure of how effective a photo is.