The attractiveness cue attaches a physically attractive face or figure to a claim, product, or request so that attention is drawn and the favorable feeling about the person carries over to the thing being sold, said, or asked for — even when appearance has nothing to do with the claim’s merit. Attractive faces are noticed fast and trigger a broad, automatic halo: the assumption that beautiful people are also competent, warm, and trustworthy.
It works as a peripheral cue — it moves attitudes most when the audience is not scrutinizing the argument closely. The good looks do persuasive work the argument never earned. This is different from Liking / Similarity, which builds affinity through shared traits or flattery, and from authority-by-image, which borrows credibility from status markers rather than beauty.
Its defining feature: attractiveness substituting for merit or credibility the offer does not have. Honest use treats beauty as an openly aesthetic or disclosed association; manipulative use lets a pretty face stand in as evidence — and, online, a striking photo is a lure, not proof of who is actually behind it.