well as you said the bg is really plain. I think bc its auron i would have used a red color for the sig instead of purple. I don't like the render at all, it just seems to plain so if your stuck with using that render take those legs off for sure, and actually resize your render first. That's way to big to be a sig. Even though it's a popout the canvas should still be around a normal sig size. ( maybe 400 x 350 or so tops .) Get rid of that white space and make it transparent, cause until you do its not a popout yet :P Keep at it.