I had a pair of Severum in a 55 years ago and I never could tell them apart. They spawned but I didn't see it. Whichever one was the female never showed it. They were cool. Probably my favorite cichlid besides JD's.
Going by the worming on the gills, I’d say the first one is female and the other two male. That method’s worked for me in the past but isn’t always reliable.