I don't remember where I got this one specifically, but I cropped the original art I got somewhere on the internet. I found it on an article somewhere before the game was released. It's the guy from Muramasa: The Demon Blade, you know, that really sweet looking game with weird controls? Anyway, it was originally meant to be a filler avatar until I got around to using the one I actually drew. I forget when Muramasa was released, but it's been a while. I did recently get the avatar I made scanned and onto this computer, but I still haven't gotten around to cleaning it up, coloring it, resizing it and so on and so forth.
So the answer to your question is that my avatar came from promotional art and laziness.