Well, I think you should try something different. You asked me on irc how do do this effect, I told you and you made a sig out of it. Try using images better, like make them work with the sig. Metal bg, make the pic metallic looking or encase it in a border or something.
Their both, still kinda plain. You gotta use more than just the metal idea. Use a mix. Sometimes plain can be good and effective, but when you have stuff going all over the place, or something like Ryoko's example and whatnot, it gives a better impression. Grey is much too plain a color for a sig. Ill give a few examples when i get back on my computer Then again, im still learning around with Photoshop
Like Deathbox said, there is nothing inherently wrong with simplicity. Don't feel that you have to add things just to fill space or add compexity. I think what you need to think about is what you want your sig to be. What you've done isn't bad, but it lacks direction. Why use the metal look if you add a canvas texture to the pictures? Why fit the text to a curved path? Why use that font? I feel these are important questions. Think about why you do something. I would say that doing something because it looks cool is not really a reason at all. There should be a unifying visual idea to the sig, and that should be the basis for your other decisions.