Touhou Project. It's Yoshika Miyako.
<span rel='lightbox'><img class='bbc_img' src='http://en.touhouwiki.net/images/thumb/2/2e/Th13Yoshika.png/200px-Th13Yoshika.png' alt='Posted Image' /></span>
<span rel='lightbox'><img class='bbc_img' src='http://en.touhouwiki.net/images/thumb/2/2e/Th13Yoshika.png/200px-Th13Yoshika.png' alt='Posted Image' /></span>
While we're here, what does your avatar come from? I'm curious.