You can download "Gallery Unlocker" mod from the "Official" source in the mods screen
Viewing post in Naruto: Kunoichi Trainer comments
Main menu - Mods - Official - Gallery Unlocker - Download.
Then restart the game.
If Official source is empty, add a mirror from here: https://github.com/DinakiS/kt_official_mods_mirror
Instructions in the bottom of the page.