For gallery unlock, this is how I did it (after failing with universal gallery unlocker)
1, go to Pale Carnations folder > renpy > common
2, find and open 00console with notepad
3, find the line "config.console = False" and change it to "config.console = True"
4, open the walkthrough provided by this forum, and at the bottom of the pdf there is a section for unlock scenes
5, find your missing scene, and copy the fourth column's content (eg.: "persistent.RoseTAGallery = True")
6, run game and press Shift+O
7, paste the copied variable, press enter
8, ????
9, profit
1, go to Pale Carnations folder > renpy > common
2, find and open 00console with notepad
3, find the line "config.console = False" and change it to "config.console = True"
4, open the walkthrough provided by this forum, and at the bottom of the pdf there is a section for unlock scenes
5, find your missing scene, and copy the fourth column's content (eg.: "persistent.RoseTAGallery = True")
6, run game and press Shift+O
7, paste the copied variable, press enter
8, ????
9, profit