http://i45.tinypic.com/2jahqnn.png
This is the part where I don't like your signature at all.
Try to smudge your render, just like I did real quick, not perfect, took me 30 seconds.
I don't know how you came up with that glitchy foggy spot, but try to edit it and try to let it move together with the flow.
I don't really like this kind of signatures just because you never really did much effort on the background, copy paste your render and gaussian blur or something and that's it.
Try using your burn and dodge tool for the lightning and darkness.
I'm not going to say anything about the text because it's really bad, but I'm not really good at texts either.
I geuss, try hitting up some tutorials and keep up the work!