What you prioritise when presenting to the media and in front of the public is to convey your own messages to the respective target group as authentically and credibly as possible. However, each person has their own way of speaking, gestures and facial expressions. Some speak rather quickly and indistinctly, while others speak equally and firmly. Some use long and nested sentences, which may include a smattering of foreign words. Others use comparisons that stick in the mind. Body posture and movement are also decisive: Does your head wobble back and forth? Are you looking down? Is your body weight constantly shifting from one leg to the other? Or do you maintain eye contact unobtrusively and stand firmly on both legs?
All these factors ultimately determine our impact on the viewer: authentic, credible, likable and convincing? Or insecure, averted, unpleasant? Based on research and our own life experience, we can be pretty sure which type of appearance is best placed to convince other people: namely when I am authentic and credible.
In general, we understand authenticity as a term denoting convergence of appearance (how I appear to others), and being (how I actually am). If Klaus Kinski went crazy on TV, it was certainly not likable – but authentic, because he was known to be a choleric person.