A woman in a pink shirt takes a photo of a man standing in front of a large photo of a baseball team.
Children drew a mural of themselves in front of a football picture.
The action being done by a woman--singular adult,  is not children--plural non-adults. If a group drew a mural of themselves they are performing the action on themselves, while a woman takes a photo of a man is performing the action on another. The backdrop pictures, baseball and football are two different sports.
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