With a sceptic: look at the face, and let them look away.

With people who already agree, eye contact builds connection. When persuading someone who disagrees, in person, staring can harden them: look at the face and let them look away.
P Evidence: promising. Good studies, but small or few. Use it and keep checking.
Chen et al. 2013 (two studies; hold loosely).
Not medical, legal or financial advice.
In The Ecosystem every framework comes with a daily action, a room that checks in, and the full library.