They need lots of work...what system do you use?

Here's the problems:

1. The renders are WAY too blurry
2. You are putting too many things into a signature and they aren't blended well-try feathering!
3. Your sigs seem just a tad choppy-try to use better renders and try not to squeeze everything in
4. The colors are plain and do not stand out well. With signatues, you want to make people look! Use more capturing colors!

Sorry for all of the harshness. I'm just trying to help out my fellow sig-makers!