hmm, quite difficult to say..
at first glance i would have said you were right, first one male, second and third female, judjing from the overall shape (fatter belly in the last two pics), but generally males will have extended anal and caudal fins, so that would make the second photo a male for me. but im not a specialist in raja (mine are still juveniles so quite difficult to tell).
if you wait a while longer for them to mature you will definitely see more of a difference.
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