I'll be the first to say outright that they're just... noobish sigs? Nothing wrong with that, you have to start somewhere, but it's too tutorial-esque. Like others said, you got to start using actual brushing and smudging and work on the colors. (You can't have just a monotone background, one color. And you can't just mix-match colors, it has to be smooth and sexy
)
But then, I also suck at sigs, so just keep trying, and you'll be making sigs like all the rest. I know a lot of these guys early sigs were horrible
.