They all suck, no offense or anything, but you need to seriously use different techniques then brushing. Not to mention, the text doesn't flow with the signatures at all.
if i had to pick the best
it would probably be the first one.
im sorry, but none of them arent really that good.
the background color doesnt match the render
the render doesnt flow into the background, its just there.
and then there is just text.
1st one is the best, but that's not saying much. You have to learn resizing and dimensions before you make sigs. You would never be able to put those in your signature if they were signatures, as was said, they look like images that don't flow with the same background for each of them. Try something called a tutorial.