Did you ever find it? I'm missing 3 and that's one of them.
Any idea how to get Sasha's second cg or Datu's second?
The Ansel CG I've explained what I remember above, the missing Sasha one appears when you compliment him about his chest and expressing "You can't stop thinking about it." (it's right after the night alarm mini game)
Datu's second CG can be obtained when there's the knocking scene, basically if you're romantic to him and express that he's so close but so far, he will send you a pic (very cute one).