Ahh the art of making sigs. TBH these sigs are better than most I see on the web. BUT... in saying that they are pretty much the same thing 1 image on a pretty background with some random type.
Loyalist is pretty much spot on move onto something different, test yourself, and you will eventually pick up a few things about structure and so on.
The google one is great, it makes a statement and goes against the norm.
Just a tip for expanding your skills: try making sigs where everything is original.
i.e. a drawing or photo that you have taken and so on. If you can do that you are well ahead of the rest of the crap sigs I see floating around.
Good work and good luck.