Éste demonstrative pronouns

I was reading a book and came across ‘éste sonríe’.

I understand that it is demonstrative pronouns but unlike English, we don’t say ‘this is smiling’ when referring to humans or living things.

Is this usage common in Spanish as I understand that it is used to avoid repeating the name of the person twice.

Example Voy a visitar a Pedrito Éste enferma. (Pedrito is sick)

Did I use it correctly ? I am not quite sure how to use in sentences to talk about someone.

submitted by /u/Mentalaccount1
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