Andrea is great! In our noir crime story she is a ray of sunshine, which is even more impressive considering her history (neglected as a child, drunken relatives, etc.) She can become your "best girl" in the club, at least it seems we can make such a decision in the future.
I agree that more Dalia would be good, she is also an interesting character simply by what info we get about her on the side. Also quite a catch for a guy able to look beyond her job.
As for Sophia, well, it seems I have a sort of reputation in the thread when it comes to her.

The again, her becoming a LI option would be turbo great, even if a lot of this particular story would be in the epilogues due to how far the story is currently. But being able to worm our way into the eccentric heart of Sophia would be a tasty option in part because it would be a love story of the more unusual kind.
By the way, in the new teaser pic with Andrea it seems that either Hana or Sophia are in the background. We can see two black leggins wearing legs. The two characters consistently shown having a faible for black clothes are Hana and Sophia, so these legs most probably belong to one of them.