I love the text.
Lighting looks nice as well.
Personally, what you've done around the sig doesn't look that great to me.
It's creative, but I'm not digging it.
The tag looks nice, but you've only created a good background and plopped in the render.
Try to expand more, use your creativity, because I can already tell you are creative and add in things to make it look better.
It's a decent tag, it's just incomplete, imo.
Kiu.