Stance and balance
A balanced stance lets the skier manage pressure without fighting the skis. In video, look for a body that can move with the turn rather than falling inside, sitting back, or bracing against the outside ski. Balance changes constantly, so one frozen frame rarely tells the full story.
Head-tracked replay helps because the skier stays in the same part of the screen. That makes it easier to compare how the hips, shoulders, knees, and skis relate through the transition, the fall line, and the finish of the turn.