http://www4.pic-upload.de/22.07.10/3u3rtkoddz4.png
CnC
Printable View
you have bad composition in here
render is too small
no blending
effects are off, they are just slammed on bg
no focal point
no depth
monocolor
----
if you are newbie, start with smaller canvas, it is easier to fill it, here is too much space, watch some tutorials to learn making of effects
I would recommend to transfer render closer to the center, make some blending with smudge, blur sides a bit, to make depth and add more effects;)
I see no reason why you would fail, you just need practice, no one start with perfect signatures ;) as I sad, watch tutorials, try to download some PSD packs, there you will see procedure of sig making too (if you done this dont rip!) and after then it will be better ;)