If this is the same as your other post about recording a session you need to make sure that all parties are aware of it. There are a few posts in the Brisbane forum about punters doing this without consent and then getting caught, not a good thing.
Remember that the ladies might be doing this as a side gig from uni and would not appreciate their pictures getting out there. If the level of trust disappears then there will be a reluctance by the sexy "non-professional" girls to try their hand in the industry, so to speak.