http://www.doujinshi.org/book/325814/
http://www.suruga-ya.jp/product/detail/ZHOA39361

Not my scan

02: Kim Kyung Hwa, from Irresponsible Captain Tylor
05: Gin Rei, from Giant Robo
06: Sailor Moon
08: Eni Hanner and Yumi Hanner (the twins from Irresponsible Captain Tylor)
11: Nadia, from Fushigi no Umi no Nadia
12, 13, 16: Ami Mizuno (Sailor Mercury), from Sailor Moon
17: Yuriko Star, from Irresponsible Captain Tylor

9-18: Sally Yoshinaga, from Brave Express Might Gaine.

And I'm not sure, but I think that:

14: Chihiro Fujimi and Skuld, from Oh My Goddess!

Base +13