It's alright. I don't like how the focul is robbed by all those effects passing by his face. The explosionish thing on his shield is really tight though. It's not bad, but it could use some work. Clean up that focul and it'll look much nicer.
light source should be on the right, it looks cool how the shield almost keepts it all out but it works against the shadows, try some more effect an see what works