ima gonna be critic, if everybody sais your good while your actually about avergae skilled you wont get better fast ;) .
The background is a colour with brushes, wich looks fine but there's nothing really to it. The text is outside the actuall focal point. That ruins the sig. The avatar is badly shaded. Also the render doesnt fit the background. Try to get colours that fit the render a bit better next time ;). Thats the easiest part. Now to hard part. No smudging wich makes it look like crap, here's no depth in the sig. Also fractals are kinda old skool, they fine for well Fractal Sigs, not for focalled sigs. Get your depth in by playing with Curves, also try Gradient Mapping and Photo filtering. They make your sig look a hell of a lot nicer. ;)
Good luck with your next tag ;)