The pictures in pool #1593 are done by the group http://haijindeath.net/

Here's the credits from the manga:
http://img404.imageshack.us/img404/2551/creditsd.png

Hopefully it contains the artist's name in it. If it doesn't I could upload what looks like a messy signature after the afterword.

Edit: After snooping around some more I think it's kou_(haijindeath). Should have checked the wiki instead of just plugging in haijindeath into the tag search.