ANDREI_REPET Ultra realistic YouTube thumbnail. Male math tutor explaining physics dynamics in front of chalkboard with force diagrams and arrows.
Face expression: strong visible emotion, mouth open mid-explanation, raised eyebrows, forehead tension, intense engaged teaching expression, NOT neutral, NOT calm, NOT passive.
He looks like he just discovered something important and is urgently explaining it to students.
Background blurred chalkboard with physics formulas and motion vectors.
Trigger word: ANDREI_REPET.
High contrast lighting, cinematic depth of field, sharp focus on face.
