I hope your kidding? It just looks like an image that has been sharpened. Your text sucks. Why don't you tell people what you did. It looks like you copied an image and cropped it and slapped horrible text on it. I don't know what I am talking about? Doubt it. Looking at that piece, your nothing.
In all honesty, I don't like the text. You should try placing it somewhere more interesting, and possibly using colours that fit with the rest of the signature.
If you just 'whipped it up', you obviously expected it to be not-so-good. He's trying to help you, and since he's obviously more of a GFX artist than you, I suggest you listen to him.