The first one is a little odd, and I can't really tell what's going on. There aren't very many effects and you pretty much just took a render or three and slapped it on there, adding some lighting effects and whatnot.
The second one is better, but I dislike how the background is mirrored with those two things on each side. I don't think I've ever seen a mirrored signature, and I don't really like the look of it. Try adding more effects and the such.