Wow, nice work. It's tiny but captures the avatar almost perfectly. The shadow is farther from the sphere in the original, but that doesn't seem like a problem. The edges look slightly jagged due to the size, a bit of manual antialiasing might really improve the piece further.
Thanks for commenting! Anti-aliasing...hmm. I really hate doing this, just waiting for animated .png format to get on the rise. Or...I could lighten the color and bit for it to fit into dA's colors well.