Lol looks good for one of your first , I know you use gimp and that you can't make sigs with it like that good but you should blend your render a bit more though
No border, no text and render does need blended a bit more. You have a good backgroundi n place now you need to add those factors in and maybe a couple more effects. Good for one of the first. Also REALLY big for a sig. 8/10 on beginner scale