Warmth times presence
Researchers who study charisma keep landing on the same two ingredients: warmth (you make me feel valued and safe) and presence/competence (you seem capable and fully here). Charisma is roughly the product of the two — high on both, and a person feels magnetic; high on only one, and they read as either nice-but-forgettable or impressive-but-cold.
Crucially, both signals are largely read on the face and in real-time expression — not in what someone says, but in how present and warm they look while saying it.
What the face is doing
Warmth shows in the eyes and mouth: genuine engagement of the muscle around the eye (the part a polite smile can't fake), relaxed brows, an unguarded resting expression. Presence shows in steadiness — a settled gaze, an unhurried face, a jaw that isn't braced.
Charismatic people also tend to be highly expressive and highly responsive: their face moves with the conversation, mirroring and reacting, which makes the other person feel seen. Flatness reads as distance; responsiveness reads as charisma.
Trainable, not magical
Because charisma is built from warmth and presence, and both have visible facial signatures, it's far more trainable than the word suggests. The first step is knowing your starting point: do you lead with warmth and need presence, or lead with presence and need warmth?
Most people are lopsided — and the fix is specific, not vague. Knowing which signal your face under-sends is the difference between 'be more charismatic' and an actual instruction.