The self-portrait in mirror says to me: I have no friends who have ever taken a picture of me, and I'm so embarrassed about this online dating thing / have so little self-esteem that I can't ask someone to take a couple pictures of me, or even go outside and use the delay feature of my camera to get a decent self-portrait. Is that a somewhat harsh assessment? Yeah, probably, but it's the 0.5s reaction, which is, for-better-or-worse, how a lot of the decision is made.

And, yes, the semi-professional glamour shots can be an issue too, but in my experience they are much rarer. And at least in that case the person has enough self-esteem to try to look good.