Q: "People are riding in a crowded truck bed." Does this mean that "The people are talking to each other while sitting in the truck bed."?
A: it is not possible to tell

Q: "A woman eating a large fish in a restaurant." Does this mean that "There is a woman eating swordfish in a restaurant"?
A: it is not possible to tell

Q: "A woman in knee-high white boots and a dress stretches out her arms." Does this mean that "A woman holds out her arms to hug her friends."?
A: it is not possible to tell

Q: "A messy haired girl in a club." Does this mean that "A messy haired girl in a club."?
A:
yes