You need to unlock all other endings, then make sure to START A NEW GAME so the game realises you've unlocked it all. If you check the gallery then, everything should be unlocked.
copypastus
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If you mean the ones with grey hearts they're for going home instead of heading into the cave and bedding only 2 out of 3 guys before going into the cave.
If you mean the final two pictures on the last page they should unlock after you've slept with each available guy at least once (they've openened their eyes in the main menu). If you've unlocked everything else usually these 2 unlock as a byproduct.