Whodunnit or who's about to

There is nothing at all written with this photographs - but look at the expressions on the faces! It's like the cast of an Agatha Christie mystery were gathered together before the statutory murder and we have to guess who did away with who. I suspect the victim was the airy-fairy lady sixth from the left, but there are at least three potential suspects. Or has the lady in question murdered the butler and the others are suspicious of her?

Done