I think it is kind of one of the fierce gestures and looks great for a pose. Looks Attractive and powerful when done with a suit on. You could even try with a dress shirt on and it would still look appealing. An Attractive pose demands a perfect outfit. Believe it or not but waistcoats are quite dazzling these days.
With these many poses, you wouldn’t need to think much about posing for a photograph again. And while you are at it, you might want to look Attractive with some cool shorts on like this.