You are using too much Bevel and Emboss, and you are using a high pixel stroke which ruins the signature.
As I've seen you have used an image and attempted to render it by removing parts, which kind of failed in this.
My suggestions would be firstly fixing your render and using text related to the colors of your image which will help it blend in.
Also your picture itself was marked with those circles due to them not wanting to be ripped off, so try those who are not protected.
Some color play and correct usage of images will make it end up like this:

I'm also rendering my images to make the background transparent, so if you need any image rendered, give me a PM.