Ogre-2  (normal and defeat)

White Centaur (Unicorn?) -2  (you need to be an anal virgin when finding a centaur)

Male Goblin -3 (basically an alternative version of the female goblin)

I don't remember if these are in the gallery, but still worth checking:

Pucca (bad end). To get her you need to take a loan at the Bank and don't pay. Lose the battle for a bad end pic.

Mouth Fiend. On the Brothel, hire a girl, and fail the charisma check (by being rough with them). Eventually the Butt Madame will kick you out. Look around the town and you'll get an encounter.
Note: this is like sort of an alternative path game. I never completed it because I got bored to death (sorry, not my thing), but has lots of pics, and apparently an alternative "game over".

Lord of Mount Xiuh: the main goal for now. Just keep going and look for one of the farthest mountains. It has a "normal" pic, and a couple more.

Also, I think the ghost has a bad end pic, not really sure.
And Urka (Orc) has a an animation aside of his extra "normal one", win or lose you should see it (just get intimate with her).

To free up faster on the computer, just ask someone by the profile file with the highest percentage of progress and put it in the .toa-data folder I Have 50,1% Of Progress