Hey Pyro!
This is pretty cool. The lines themselves are great...but the randomly placed aa/selout just isn't working; the outline looks choppy.
I think the helmet needs some attention, too; the shading that's there almost ignores the lightsource, and I think it could use a bit more shading and highlights. Actually, a lot of spots would benefit from some highlights here and there to add to the "metal" (\m/

) look--the bolt things on the shield, the emblem on the shield (if you're going for a metal look there), and the shoulder pads.
That should point you in some direction. Keep pixelling!
btw: nice to see you back!