The size is just way to big for a signature image. If this would be any bigger, I would have to move it to the Digital Arts area.
There is one think I need to ask about your original. Did you find it, or did you create it? If you didn't make it, then it would be someone be else's work. Editing someone elses finished images isn't really a good thing. You should try to create it from scratch and use resources that you have found.

In saying all that, your additions on the top image are good, but not great. The text is really appealing, but the glows aren't that special.
You may wanna check out the Signature Tutorial Section here: [Link]