It could definitely use some work. The background is too blurry (undefined), and the render blurring into it just makes me feel like I put on some bad glasses. Other than that, it's fine.
I guess I should have described the type of stock that would work best with my tut... The background of the stock is too close to focal and the threshold setting was too high for such a bright bg. Like I said in the tut, do what looks best to you. You expanded the mask of the blur too far into the focal as well.