Bonjour Fiona !
In "Regarde-la", la is a direct object pronoun -> regarder [quelqu'un]
However, lui is an indirect object pronoun, so cannot be used here.
If you wanted to use the masculine direct object pronoun, it would be "Regarde-le" :)
Here are links to the relevant lessons:
I hope that's helpful!Bonne journée !
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