Hi! My biggest concern is the head tilt, but you can change it up pretty easy to make it more believable. I made a really quick correction that I think looks better.(It's not exactly accurate so I suggest you change it up more) I hope this helps ^^ Keep up the work!

Other than what Castonia mention, I think you can also work on the composition and other anatomy parts for the character.

I recommend these things:
Maybe making the legs a bit shorter. Push the hand more forward and even make it bigger for that more epic feel with the fore shorting. The back arm anatomy is almost there. I highly recommend if you have a roommate or family member to take a picture in the same pose to get an more accurate anatomy reference. You can probably play with the cloth as well.

That's it for my feedback.