Yeah. Bottom is definitely female despite not much blue on lower cheek. Males' heads and mouths are bigger (gives them a 'meaner' look). Top fish's head and mouth are no bigger, it just has a slightly odd shaped head. And it has loads of blue on the lower cheek that males hardly ever have.
Re the other fish, they're individuals, so personalities can vary. And one might be assuming some kind of dominance so it may be just making sure the others remember who's boss?... kinda thing.