Essentially, their hair, makeup, clothing, and body language all suggest someone who's getting a glamour shot taken to me, and don't much resemble the women I work with and have worked with. And this is of course a hideously vague and completely subjective standard, and I really do worry that I'm being unfair.
Except.
Except that, when I wrote my first post, there were two people pictured in that article. Now there's only one. There's only one because someone in the comments pointed out that the first woman was not, in fact, an engineer employed by Toptal, but a actress whose glamour shot Toptal had swiped. Now, mysteriously, that comment is gone, there's only one woman in the article, and there's no mention of the edit.
I'm guessing ... Statistical inference? Sure, there are exceptions. But the [recognition that something is an] exception proves the [general validity of the] rule.
The OP didn't say "that woman is not qualified"; he didn't say he'd reject her for a position on sight; he just said that based on the picture, he would place a low estimate on her being qualified.
Really? How do you judge that? Why do you say that?