I don't have any humans to pose.
I have a playground with a swing which rotates to and fro. I also have children's toys and clothes and shoes.
I wish to create a scene which shows that a child "was" swinging "happily".
To demonstrate this, I placed a doll fallen on the ground near the moving swing and one of the child's slippers.
Later on I realized that this kind of setup very obviously showed that the child had either been kidnapped, or she had gone to her home crying.
How can I show "happiness" with the things I have listed above?
What kind of setup demonstrates "happiness"?