One second, forty-eight pixels, eleven other faces

Those are the actual conditions in which a profile picture is judged. And it is chosen at full screen, calmly, with no competition.

The whole error lives in the gap between those two situations.

What reaches the viewer

Not skin texture. Not eyebrows. Not the glasses frame if its tone is close to the hair. No fine lighting gradient.

What remains is the outline of the head and two or three masses of light and dark.

The three decisions that follow

Contrast between hair and background. A tight crop. Frontal rather than side light. None depends on the camera.

What a profile picture can achieve

Less than the marketing promises: it makes nobody more competent. It prevents someone briefly willing to look from scrolling past.

The minute that settles it

Scale the headshot to its display size and set it beside the original. If the head loses its outline, that is the version almost everyone sees.