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You won't be able to tell the sex from any of those shots. If you get a nice close up clear shot of the underside of the T between the first pair of book lungs. Someone may be able to help, its not a 100% though, I haven't seemed to get the hang of it personally lol. The best and only 100% way to be sure before maturity is by opening up the abdomen of a molted exoskeleton. The lining of the females internal sex organs(the spermatheca) can be found between the first pair of book lungs. It will be hard to see with smaller molts, but is generally pretty easily seen with a molt that's 3" or more.