Based on Jacinda's instructor's comment, it can be inferred that the effect that stands out in the photographs is symmetry.
Symmetry is a term that is used in photography to refer to compositions that are characterized by having a perfect balance, this effect is achieved when both sides of the image have the same weight, which will generate a feeling of unanimity and harmony.
Based on the above, it can be inferred that Jacinda's instructor is referring to symmetry when saying that the photo is smooth and stable.
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