It's fantastic in short. The banner is extremely well done and the Renji sticker of approval is hilarious, plus very suiting in the theme. The text is also appropriate in tone and colour, all very well done.
9.5/10
EDIT: Heh, beat me anemos. But that's alright, because I really like your signature too. I just finished reading Death Note actually and the banner is very moving. *Tear. Poor L. Anyway, the text outside of the banner seems out of place but other than that, nice sig. I also love your avatar, but that doesn't count.
7.5/10