Alright, first of all. Its massive! Always save your sigs as .png and make it around 150-350 if you want it fat or 130-400 if you want it slimmer and longer.
Your render is blurry your render is cramped up on one side of your sig. It has no light source. Meaning your sig looks flat.
The brushing is bad and goes over the render and text.
The text is so basic and ruins the effect of the sig.
Borders most of the time make your sig look better. But not all of the time.
Sorry for being so brutal but you posted it here so people are going to say what they feel. If you take this to heart then I'm sure your next sig will be 100x better.