That's pretty kool, kool, kool. You've already crushed the first major hurdle in gfx; harmonizing colours. Despite it being a simple process, end results pretty good.
You need something to pop. I love the blending and I love the way the signature looks but if I saw that around too long it may get a bit boring. Add another color in there or something that stands out. Incorporate it throughout your piece and then you will be good to go. I like this one though, don't get me wrong.