The claims made for professional portraits are usually inflated or dismissed. The accurate version is narrower than both and more useful.
What it does not do
It does not make you appear more qualified. Nobody has read a CV and revised their assessment of someone's abilities because of the lighting. What a portrait is and why you need one is unusually restrained on this, and the restraint is the point.
What it does do
It prevents one specific small failure: someone briefly willing to look at you scrolls past instead.
Most weak portraits are not unflattering — they are ambiguous. Cropped too wide, eyes in shadow, no clear edge to the head. The viewer is not judging you; they are not seeing you, which is worse because there is nothing to react to.
Why it compounds
Not in any single view. You appear in hundreds of lists over years, and a legible image in each is a small repeated advantage. The argument for that is ours and reads like it, but the mechanism — repetition rather than impact — is real and unglamorous.
The size question, which decides more than expression
What size means in practice goes through the specifications. The conclusion worth keeping: select at the display size, not at full screen. The image that wins a full-screen comparison is frequently not the one that reads best in a list.
Wardrobe, which matters less than the volume of advice suggests
Two rules. Avoid fine patterns, which produce noise at small sizes and interfere with compression. Avoid matching your background, for the same reason dark hair against a dark wall fails.
The longer list covers the rest, and the thing it does not say is that at profile size nobody can see your clothes at all.
Preparation, which is mostly not photographic
What to do beforehand matters more for a booked session than a self-shot one, and the highest-value item is sleep rather than grooming. The shorter tips cover what to do on the day.
If you are generating
The beginner's guide covers the process. One preparation step dominates: source photographs from different days, clothes and light.
And if it is for a brand rather than a person
Photographing for a brand is a different job, because consistency across images outranks the quality of any one.
