This looka great! It's been a while since I've seen a Pandora Hearts wallpaper being submitted. Great vectoring, it fits with the style a lot. I'm not sure if you also vectored the characters. It doesn't look lile it. You might want to give them a slight color fix according to the lighting.
It is a bit too dark though imo. I think it's the wall that makes everything look awfully dark. This way Oz' hair colour seems off with the lighting and Alice's hair blends in with the background. Changing the colour a bit could change a lot. You can always change the focus by changing the overal lighting so the wall still looks dark. I'm also not fond of the pattern on the wall...What about some baroque type of pattern? I honestly think it would fit so much better.
Text...well..I think it is a bit odd to have a picture of a text. Perhaps you could turn it in some kind of newspaper? I do love the "times part" it fits nicely. The rest of the text seem off so...maybe you want to do something about it.
Great job though! This is your second wallpaper and you are showing some formidable skills already ^^