It's not too bad, but it's really simple, and would benefit greatly from a sharpen Check out some of the great tutorials we have to offer to learn some new techniques
Render is too big for the canvas, not sure bout the double focals, it looks nice but lacks some basics, as Daecu said, check some tuts, always helps, keep it up.
If you make a signature like this, a borderline would be nice. Anyway, you have multiple focals which kinda destroy your signature. Your text is not a big help of it, too. If you apply a face to a signature, be sure to have the full face, with the mouth. Unless it looks a bit weird. In your case, I think you wanted the focal on the eye, then make it even a little bit bigger and blur the other things around so that you really get your focal there and maybe lighten it up there a little bit, make the font smaller and place it in the corner or something. Try to use multiple colors or even b/w on that one. Hope I could help you.