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Those are all nice photos of the kids. Good job! ...even better..."VERY good job!"
You mentioned the repetitive nature of lots of the "nature" photography posted on a forum here.
I think that can occur in any of the subject areas (macro, people, wedding, etc.).
I do feel that with people in the photo there is so much more potential to have more unusual and creative images made....IF the photographers look for something unusual in pose, light, expression, situation, composition etc.
I see lots of people all the time and even when I am doing a series of head and shoulders portraits that may have the similar lighting choices, similar processing (toning), and similar Point of View,.... I still truly enjoy seeing a variety of expressions, variety of costume (garments), variety of ages and facial features (types).