I don't particularily like the abstract, the second signature is fairly decent, it has nice touches to it all in all. You're really good at the space and planets thing, you should always implement a little bit of what you're 2nd nature in photoshop to most of your designs, it gives it its own personal flavor and it looks good because it's what you do good. Try to fit in the space stuff in some of your designs but it doesn't always work.
All in all they're all fairly well made, the abstract could look better provided you kept working on it.
