I would say that the one in the first picture COULD be a male, its hard to say with that picture. and the second and third picture look like females, I couldn't tell if they were the same fish.
Give them time! They are not going to show anything until they get fully adjusted to your tank and fish. This could take over a month or two! so just be patient and don't add anything so they can get adjusted if you want to see IF they pair off.
Kevin
Give them time! They are not going to show anything until they get fully adjusted to your tank and fish. This could take over a month or two! so just be patient and don't add anything so they can get adjusted if you want to see IF they pair off.
Kevin