I think it will be way better if you cut a bit of the black at the top and at the bottom or at least give it a slight bit of texture. It's probably just me feeling that way, but I'm not a big fan of solid colors. You could also consider resizing the image, because it looks slightly bigger than it should be.
I see where you're coming from, but I actually like those things about the image
. The images I posted are just the highest resolution versions I have, my actual signature is smaller.
And thanks Mikey