What would be the most apt translation for the titled expression.or the best translation for "smile" in this context?
Thanks:)

I suggest, 'Déan miongháire' = 'Smile'. Wait for more.

Sticking with the theme of taking photos, in English people often say, 'Say cheese' as the 'ee' part makes the mouth smile. We tell our kids to say 'ispíní' for the same reason as the 'í' has the same effect.

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