I think you have the wrong character. ;p Just kidding. The render is pretty good and the background is simple and effective. I'm always a big fan of borders---it adds a cohesiveness to the sig, so I'll always recommend one. Overall, it's a nice sig. I like it.
Nice and simple, looks good. The size format bugs me hough xD but that's not a problem. Your sigs might look very similar if you continue on with that style. Might need developing.