I’m not an expert on posing (far from it actually) but for me, the pose looks great. I think it works. It looks like classic flying superhero type stuff. I like the way the cape flows, it looks quite natural. I like that this guy’s a lefty. I also like that if you wanted to you could change the right hand to make him grab an enemy to hold him still and pummel him with that left hand. This pose reminds me of UFC fighters that throw the “superman” punch. To me, the proportions look correct and the physics seem to work.