Well, of course just keep messing around with it and you will learn all the technical stuff.
The text is hard to read and has no real focus in the image. If you are interested in making signatures the text needs to stand out more and not get kinda lost in the background. You can use a site like this: http://www.colorcombos.com/ to get an idea of how colors match and compliment each other. Sometimes it's as simple as different variations of the same color. Also just looking at other works for inspiration can help. Anyway, good luck with your work!