It's pretty good, but for some odd reason I can't see Shiki that well. I guess I've been on the computer too long. >.< And it's kind of an odd size for an avatar. If I were you, I'd stick to the 100x100 size.
Stick to 100X100, and you have a beautiful avvy. Very good use of colors, the way you did it, it needs no effects to make it look nice. The size is the only issue. Good job~
I personally feel that the "shiki" text is spammed too much, and it clutteres the space up. But nice !