All good sigs, but most with some little hiccups. They could all do with some sharpening, and with some of them a little levels adjustment wouldn't go unmissed. You have strange pixel quotes in every single signature, and many of them aren't really needed. They tend to make the sig look a little crowded.

The one sig I don't like is the last one... It seems that minimal effort was put into it, and it comes across with no feeling and the appearance that you only did it so that you could add a manipulation to your gallery. I think it COULD be a good sig, with some brushing and post-work, but at the moment it isn't standing out like the others are.