In your 2 sets of pics, both the "first" ones are females, the second one in the first batch could possibly be a male though shows no signs at all of being one in that pic and the second photo in the second lot is just a waste of time to look at. Clean their tails or even better wait till they finish shedding their skin then roll their tails back and see if you can notice any obvious hemipenal buldges, they are much eaier to see than to photograph..