They look okay to me, but not great, but that DOES NOT mean you wont improve. Keep going and keep persisting and learning new techniques. As for the sigs now, you need to be able to blend the renders, not just change the opacity. Also, try some work on texts, I think that overall a simple text such as arial with 1 or 2 nice effects can look JUST as good as a custom font, or even better. As I said, just keep going and learning new techniques, theres many nice people to help you out here at Climb-X.