While I appreciate their effort to pass (at least compared to the ones we watch on this site), I can still clock them immediately, mainly because I can tell something is off with how they look, which causes me to look more closely at them, for the telltale sign they are a male, their hairline/forehead. If that's something they've covered up or they're wearing a realistic wig, the next sign is the jaw. Even the most daintiest of men still have a jaw that is definitely larger than a woman's, even after surgery. I also look at the eyes, because men's eyes are wider apart than women's.
And that, fellow Kiwis, is how to always be able to clock MtF troons, if you are looking at just a picture of them.
For instance, these two troons, in my opinion, could definitely be mistaken for a woman if you're not paying attention to details.
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But again, the hairline/forehead, jaw, and eyes gave it away.