Neither of them are what I'd consider good. They're passable at best.
You fail to achieve any sort of blending, any sort of coherent flow, any depth(the 1st one has depth itself, you didn't create it, nor did you utilize it well.
Since they're your first signatures, this is absolutely wonderful. I'd wager that you aren't very experienced with whatever graphics editor, but, that will change with time. I look forward to seeing more work from you.
Take a look at some tutorials, I believe I have an intermediate-level one that you may be able to follow somewhere here, but any will do, so long as they explain the concepts of depth/blending/etc.
Overall, being your first sig, I give it a 7/10.
I look forward to your next one, and hope my comments helped.