Thanks for coming to ask for CnC from me, muc appreciated. :y:
First of all saying this is your third signature it's not at all bad.
You want to improve so here's how to;
First the signature doesn't have a ligth source which is key in sigs for depth and judt general look also this siganture is rather dark, you can add lighting effects in photoshop, add lens flare but don't just put a light source anywhere, make sure it compliments the sig.
Second your borders are just horrible, subtle borders (thin) or no border works best imo.

Yours are far too thick and just aren't eye pleasing.
Text is anohter key feature of a signature. Yours again isn't the best it's just really slapped on tbh. :n: Shoved to a side or corner is not the way, text should be nice and effective and compliment the signature in as many ways as possible, in some cases no text works well.
You must login or register to view this content. is a great text tutorial, take the tips on board.
Size of signatures is another key thing, to provide a signature at the side of yours takes great skill and the signature needs to be like 'ZoMG

'. For horizontal signatures (which I would recommend you stay and practice at before vertical ones) I would say stay at sizes that compliment the signature and don't leave too many empty spaces. :y: 400x150 is a nice size for a signature.
Finally I would say just be open to new styles, techniques in your signature, don't limit your knowledge and stick to one style forever. :y:
Get yourself on deviantart.com and other GFX sites and follow tutorials but remember to credit the tutorial when posting.
Here is a tutorial for you;
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Take these on board and stick at it and you won't go far wrong at all. :y: