I don't feel comfortable posting other people's fan art, especially without their permission, and most of it is obviously from Japan. So, I'm linking to the other sites. If any of the artists want me to remove these, I will.
This second link is actually three pictures of increasing realism. The artist also has a few Bushido Blade comics, including the next link.
This artist's blog includes a cute chibi Mikado (in which she is identified by another role her voice actress performed "Currypanman"): http://okirakustudio2.web.fc2.com/analogue/a_022.htm
The also did a cute valentine's picture of the four ladies: http://okirakujuraku.blog97.fc2.com/blog-entry-2353.html