i would say first pick male? second pick male? third pic is a female.Usually if there is black color in the middle portion of the dorsal fin its a female but your first pic may be a male
the first two pics are of the same fish. when the fish in pic 1 gets dark and shows breeding colors there is a noticeable black spot on the dorsal fin. thats why im a little confused as to whether it is a male or female.