I can throw Terence Higgs at Mason, he's the Art teacher at Hogwarts and it's his first school year there.

For Bronwyn, if she has the reputation of being discreet, Edgar Minks could always ask her help with one of the women who works for him (or more accurately his alias Leon Bunyip)

If Sloane is interested in art she could always talk with Terence, or they can cross paths at school for any other reason. He's a good listener when needed.