Q: "Cowboy with a purple shirt and black vest trying to hold on during a wild horse ride." Does this mean that "A cowboy has a purple shirt"?
A: yes

Q: "A group of people are watching fireworks outside." Does this mean that "people at work"?
A: no

Q: "A shirtless teenager bounces on a trampoline as other children watch." Does this mean that "A shirtless teenager is acting on a dare from the children."?
A: it is not possible to tell

Q: "a photo shoot of a swimsuit model on the beach." Does this mean that "A person being photographed on the beach"?
A:
yes