Pretty good piece! The armour is godly detailed, the lightning effects are strong. (From both the fire from the door, and the moonlight above.)

The head seems a little out of proportion, but not by much.
The feeling of the drawing is generally pretty solid, I imagine him walking away from his friend/wife on his way to duty, looking sternly ahead.

I would perhaps have enjoyed to see him look back instead, but all in all, this is a very good drawing.

His head seems to be to big.
Besides that it looks pretty well done!

The rendering is tight and the lighting is beautiful as usual, but I think the pose and composition could be stronger. That's something I can't get past, becasue i know you could've set it up with a stronger composition.