These are all the images available in the in-game CG gallery viewer. Obtained via automated screen capture and saved as PNG, which should be lossless.
Sadly this is incomplete since there are other variations (like pubic hair and cross-sectional views) that can be seen while playing the game or replaying scenes from Memories but which are not included in the CG gallery. The cross-section stuff looks to be recycled from other Tsurumiku games so you're not missing any original content there.

Game site: https://www.turumiku.jp/product/inj-knic/index.html
Info: https://vndb.org/v47643

looks classic

Base +7, Coledas Ukgent +14, LurkusPocus +6

https://www.getchu.com/soft.phtml?id=1256232&gc=gc

Base +27, Coledas Ukgent +14