Hm, looks like a book cover more than a signature so it's pretty cool :].
The lighting brush you used makes it look washed out, those brushes under the text look too sloppy and the text is lump sided. The tag it self isn't bad but it looks extremely plain, you want to make it look different than a stock made Black and white.
Remember that text can either make or kill a signature.
To improve it I would suggest moving the render a bit to the right side, remove the text, use 3-4 black and white gradients set on luminosity 100%, remove the boarder and sharpen up the render but leave the back blurred.
GL
Like this CnC? +Rep ^_^, I'm in a race again'st Slave and Apathy.