From http://www.geocities.co.jp/AnimeComic/6469/rakugaki.html (Archived). This was linked from その他の作品 on artist's website. The site also had a page for these sketches that seems to have exactly the same contents but most of it wasn't archived while the geocities mirror was.

らくがき帳

暇なときに描いたラクガキです。
このため、未完成のものやいい加減なものもあります。保存状態が悪いものもありますがご容赦下さい。

The titles are from the alt text of the images in the page.