I'm not as good as you lot at making signatures, but I've been making them for about 4 months now, and here is my newest. I really messed up with lighting. Constructive criticism always welcome.
Lighting looks a bit fake. And the render looks squished. You should hold shift while resizing the render. Text is meh.
Yea, try never to distort the render. I'd check out a few tutorials and follow closely, try and learn some effects and such. Keep it up though man!