First, the border is bad. You should really get over thick, fuzzy borders. I used to be a fan of them too, but they're really killing your images. Second, I'm going to tell you to stop now with using distort filters. I used to use them with every single image I did, I didn't have one image without a distort filter. But really, the sharpnesss and the ugliness and the bad colors and the ugh ._. Too much to explain in criticism, so forget that. Alright. First, kill the border. The background is sharp and the filter is bad. The colors don't match. And you picked a bad render that is low quality. To fix it, remove the border. Use a different background, maybe a gradient map. No filters. And you can use a better render. Almost forgot, kill the lighting star, it's bad. You know, you shouldn't make images like these and upload them and claim you were bored. It's like an excuse. If you're doing an experiment, then don't upload it unless you intend to make it an actual image in the long run. Test out the filters, figure out what is ugly and what is good. You should really, really, download a resource pack and follow some tutorials.
@Sapna - I know exactly what he did. He first put some color on the background, then did a distort filter, I'm going to guess the filter he used was waves. He then slapped on the render and added a nova star, then topped it off with a fuzzy border. This is exactly what I used to do, but nobody ever gave me any harsh criticism that would make me cry. That's the only way to improve imo, get harsh criticism and cry. After that, I am motivated to do better, and follow every last tip I get in the evil, harsh criticism.
This is weird, I never imagined myself being the one giving harsh criticism a while back.