What can I say? It's a nice piece, your basic chibi.
To be honest, it doesn't look any different from other chibi's I've seen, but then again I don't really like anime stuff, so I don't tend to look at details when it comes to stuff like this.
But that's not saying your piece isn't good. Your piece is great.
The only thing wrong, IMHO, is the hair. The lightest highlight in the left topmost part is a bit uneven. The whole piece is so smooth except for that. I'd say try to even it up, get it a bit more rounded, AA a bit, and it'll be great.
And I hope you don't take offense to me saying that your chibi isn't original or anything like that, because once again, I see very few chibi's and I really don't like anime. It's a good piece though.