Taking pictures specifically for a dating profile would show that they actually care about finding a person they would do other things specifically for.

This is a dead giveaway that you’ve never asked men why they don’t take and share pictures of themselves. Most men in the anglosphere consider it vain and self-destructive to obsess over their looks. You can also see it in the way they buy clothes (“I’ll take 5 pairs of the same pants, thanks”), the way they cut their hair (“just take an inch off and even it out”), and the way they present themselves, often with as few accessories and adornments as possible. Those they do have are utilitarian or deeply personal.