Vector brushes aren't that hard to make. They all tend to follow somewhat the same theme, so mistaking brushes that someone never released before for something you saw on Deviantart is common.
Now back on topic as to what we think of the piece itself.
I like it. It has a nice kind of mysterious ring to it, yet it's simple.
Very nice Digital. I really like vector art, perhaps I should consider trying to learn such a style, there so many artistic elements involved which makes it much more expressional then pretty much any other style I've seen.