* They/Them: This is the most common and inclusive option, especially when referring to multiple pictures.
* "I took some pictures, and they turned out great!"
* It: You can use "it" when referring to a single picture.
* "I saw a picture of a cat, and it was so cute."
* That/Those: These pronouns can also be used to refer to pictures, especially when pointing them out.
* "Look at that picture! It's amazing!"
* "Those pictures are from my trip to Italy."
Ultimately, the best pronoun to use depends on the context and what sounds most natural to you.