I would say that the first 2 pictures show a female. This is due to the blue speckles inside of the black dot on its side, I have herd that due to selective breading, the distinguishing traits of the finnage and pink bellies has become less reliable because breeders are actively seeking these traits in their fish. As you may be able to see, my female that spawns regularly has more dorsal finage than most males.. Also, if you look at the shape of the head, females tend to have a more gradual slope through the nose and males tend to have a steeper slope from the top of the head to the nose.
Here is pictures of my pair. notice the blue spangles around the dot of the female, and not dots around the male. Also, notice the difference in head shape that is present in all of my stock.