Where do I start?
UHHHHH lets see....
Well you could use some brushing in the bg. The uniform black just doesn't look good on almost anything. the text looks pixelated to a degree so I would suggest fixing that. Also get rid of the gradient on the font it just doesn't fit IMO. Also the render can be a higher quality (It looks pixilated in a few areas). The glow around the render looks good but it could be a little bit brighter. And the glow near the text shoul encompass the text. Nice job for a first sig though. I know how to make that first one.

BTW are you trying to say that your current wasn't made by you?