As Teal pointed out, your banner is extremely plain. From what I can see, all you did was throw Zoroark onto a gradiented background, add a border, some text, and gave the text a shadow.
With banners, you want to have more effects. A more complex background, having flow in the banner, lighting, etc. all lead up to a good banner. I'd recommend trying a bit harder if you want a better looking banner.