I think you've went overboard with the gradient. You should lower the opacity a little bit. The smudging reminds me of the northern lights (if it were blue). Well done.
For a second, it's good. I'll give you some pointers, though. As said, the gradient is too strong and makes the signature look bland and the same. Smudging should go one way, and I see it's going a few. The text is kind of in a horrible placement, and distracts from the focal. You should higher the contrast by a lot. And you should attempt to incorporate more vivid effects. For a second, it's great. Just listen to people's constructive criticism, and keep it up. You'll come along.

