Cut the borders, they're a little out of style now n___n
In any case this is your best. You've gotta work on dynamics though, from your tags I can see right away you rely on big stocks, your backgrounds are falling behind and just being sorta... backgrounds, and not fitting the tag very well. This being a prime example.
try working with filters and even take game wallpaper stocks as backgrounds. C4D's liquified to create the initial flow is also a very good technique. Which is another thing you need to concentrate on, bringing out the focal, ensuring nothing is taking away from it ie. a second focal, and add flow if needed (often is). Anyway, go in the direction of the first tag I linked, it's a little crowded but a step in the right direction indefinately.
Keep going.
Lol, border ain't out of style or maybe there out of style here idk. About the background, I normally I drop a dark colour from the render and then do a couple of smudge layers. I don't like getting a game stock background and putting it on, as it shows no effort. Also about the sig you linked about the render not fitting in, I made that using a tut and as you can see it didn't turn as well, as I didn't do what I normally do for all my sigs but thanks for the ideas/improvments. I'll take them on board.
@ Cold fusion
Yeah the devil jinn sig is kinda blurry as I didn't sharpen it ( I was a noob when I made it as I didn't know about sharpening) and didn't save a PSD so I cant edit it as well. So i'll try to edit it when I'm not lazy :P and thanks for phrases.