I'm afraid that won't be possible, there's only a single image file for each scene - texture_00 in each folder - in the l2d folder. All the scenes are done by code in the game putting the pieces in the file together and animating them, not individual frames like they were in the original game.
I'm guessing you missed the announcement that he's throwing away the whole bi-monthly updates and ETAs, so there's no such thing as a 'november update' anymore, just 'v0.9.0' update which will release whenever
oh that was a total? i thought it was a maybe if the harasment kept going
i usually check the changelog to find all the available scene for each character.
New content with the teacher should be available at the end of November, but since the author is late with the current update, this update will most likely be in December.
If I'm not mistaken the teacher has one where she's riding you which ain't in the gallery which can be triggered at school and I believe by calling her
