I think he looks cool, keep going with it.
I can suggest making the hands slightly bigger. Other than that it's all good.
I say for his right hand to be facing palm down and his left arm raised a bit higher than his right, again, palm down. Sort of like a faux Shun Goku Satsu http://wikicheats.gametrailers.com/images/thumb/b/b6/SFIV_screenAkuma03.jpg/500px-SFIV_screenAkuma03.jpg
I agree with the enlarging the hands comment.Also, he seems a tad delicate overall? Perhaps grabbing his body and free-transforming it so it's slightly larger in proportion to his head will give him a meatier/more muscular/sturdier vibe? Really cool pose, though. Looking good!
Personally, I think a lithe Akuma could work just fine. Musculature is all about style and personality. In the game, Akuma is quick and powerful but can't take too many hits himself. Even though I have my own way of drawing Akuma, I personally approve of this style and encourage it.