That isn't vector. I can barely tell what it is, actually. What is it supposed to be? It looks like a random amalgamation of blue glowing superimposed next to pixelated seaweed. Is this one of your first attempts at digital artwork? I would recommend that you try some tutorials for digital illustration. Tutorialized.com could help you understand how to manipulate the programs more professionally and give the impression that your subject is in clear focus.
Right now, this piece just seems odd and misshapen. I think it needs a lot of development - the subject is hard to identify, the background is a blurry mess. Try not to take this as an attack on you; you have potential but you need honest critique to grow as an artist. If you put more emphasis on bringing the subject into the foreground by making it easily understandable and not just hoping that people recognize the vague outlines or shapes because it's based on a TV show, you will get your work across to a larger audience. My apologies if this sounds harsh.
Yah, it does need alot of work it is not my first time using my program, I have been working with Gimp for almost 2 years now, but as mentioned in the comments, I was experimenting with texturers and layers.
Understood. If you're interested in pushing your work father, I'd say you have a good base by which to do it. However, I would recommend looking into books dealing with the program you're using so you can expand your knowledge and produce work that improves as you learn.