Add curves, its to flat looking Its also to bright and everything blends waaay to much. Also you don't have a focal point, you don't always need one but a lot of the time it makes it look better. Add some color variation as well to help distinguish different things in your signature. ( focal point - center of attention on your tag )
I was thinking of replacing that Haseo with a different Haseo form or something else...eh. the colors at the beginning were near enough the same so...