you really need to start using some techniques...to be honoest for 3 attempts this is looking pretty sad...each time you should be improving instead of revisiting the same technique over and over...
same text, and basically some renders thrown onto a pretty bland BG....not too sound harsh, but i am all up for constructive critisism....one way for improving it to stop using text layer blending options like the outer glows etc. as well you should make the text color match the sig...use some actual colors from the signature itself, then maybe add a i pixel stroke from blenging options with another color from the sig then maybe lower its opacity...also try too look at how the sig reflects, because the font you used really does not match the feeling of the signature itself.
Renders have alot nicer effect when you use only 1 or 2 and they are much larger and you can blend them into a signature rather then them just tiny and sitting in the middle of nowhere...
and of course...whenever you complete a sig try to at least add a 1 pixel border....if you want you can go for the 3 pixel. Just look at some of the tutorials we have and i am pretty sure you can get past some of these slight "blocks"