I like only one out of all of em. The text on em throws em off.
You shouldn't use the most coolest font with like a grungy look to em because its hard to read and downgrades a signature. Simple fonts can be affective.
You want to put the text as close to the focal as you can because if its to far off than its distracting and makes the signature not as good.
If I was you I wouldn't put the text outside the borders since it ruins the flow.
You should use a Light Source and smudge more to give it more depth in a signature.
if you don't know how to do that i'm sure if you look at the signature tutorials that they will tell you examples on how to do depth,flow,more details,etc
Edit: I seen on some of the signatures you did do a light source but you put a big white,blue,etc color in the dead middle which it makes it look bad, get a soft brush and have the edges of the soft brush touch a little down, there a different ways in doing it so you will figure out a couple different ways.