I think it looks excellent... for those who have never had to stand somewhere outside with a gun for a few hours in the snow... its about like this :P Really gives the impression of a stalwart defender of humanity!
Thanks for the comments.
the snow is very easy to do, and cheap.
-baking soda
-water
-PVA glue
you need a paste that has the consistency of toothpaste.
in france you can by a box of bakink soda to 250gr for 3 or 4 euro... yes very cheap snow
Dude, it might be, just MIGHT be, that you overdid it with the weathering just bit that tiny little fraction. Just the washes or just the snow would have probably looked completely awesome, but in combination it looks like the cybot was made of salt-dough and left in a wet place for a few hours.