Hm...well the image is a bit too small for an entire wallpaper to be made from it.
Yo, just posting before work to say "Hello" and to make sure no one thinks I disappeared again.
Everything I Learned In Life, I Learned From CLAMP
11. The most powerful people are alcoholics.
23. Tokyo Tower is, more than likely, the source of all evil.
29. Torture and mind games are just another way of showing you care.
Ohayou-gozaimasu, class is in...oh wait. sorry, force of habit.
It looks good for a first sig, there are many techniques that you are gonna have to get used to. Thus I won't really critically critique it. (though you could join my class, along with imotochan XD, just pm me for info if you are interested.)
Though the text should probably stand out more, and you usually shouldn't play around with the swirling text effect.
Overall I think it's pretty good. The lines and the rectangles are pretty cool but they are vague in the sig. You should have saved it as png, instead of jpeg.