really isnt to bad of a sig. For being new to PS
One main thing missing from the sig and is one of the most important things is blending the sig in with the BG.
The effectts are good but stand out way to much because the render is black and white, dont really put a black and white render in with a very colorful BG it will take away from the focal point in the sig witch should be the render.
Another thing is the text stands out way to much also try making it a little smaller and just lowering the opacity of the text to make it blend in with the BG more so it doesnt take away from the focal point also, if you just do a few things to it you could have a very good sig IMO.
All in all is just keep working on making sigs and looking at tuts to find a style you like and work with it to make it better, and welcome to the void.