Welcome Robbie. Nice introduction! Hope you'll enjoy your stay here.

As for the signatures.
I like the 2nd one! I think the blending of the render is really cool.
Got some nice effects going on in there.
Just needs some work on the lightning and colors if you ask me.
The tag overall is a bit bright, you could try to burn some of, create some shadows.
It'll improve you lightning and it'll also improve the depht a bit!

Keep it up!