Well, the skirt tetra isa female looking at the way she´s built (sturdy abdomen) and her dorsal is rounded while a male is a bit more pointy. The panda platy is female. I´m not sure wether the orange wagtail platy is male or female. Picture 2 shows a normal analfin. But from that angle hard to tell wether it starts being pointy or not. In picture 3 & 5 it looks as if the analfin is clamped, so that's why it's hard to tell.