The armor looks good but your strongest point are the faces. The part where i wold improve if i where you is the level of details in some parts of the image. for example here the armor especially at the hands wold use some more work and details. Hope it help
The armor has lots of details and it looks really realistic, I am in love with this drawing. That single stroke of light brings the awesomeness to a whole new level, i love the way the blade reflects the light.
I LOVE THIS!!!!!!!