Holy Cow! That's fantastic. It's frightening and functional. Not the type of thing you'd like to see in a dark alley at night. The gas filters and glove, coupled with that horrific mask is great.
Is this a particular version of the Scarecrow? I've never seen one in the comics done this way... but of course, I haven't been keeping up. If that's your own personal design, it adds even more to it's awesomeness.
Did the voice changer work?