Q: "An skinny long-haired man flexing." Does this mean that "A skinny guy is flexing in a gym."?
A: it is not possible to tell

Q: "A group of young men are playing basketball outdoors." Does this mean that "The men are outside"?
A: yes

Q: "Three people, an adult asian in white, a white male in green, and an asian child stand for a portrait overlooking many mountains covered in trees." Does this mean that "A family has their first formal portrait taken by a professional photography."?
A: it is not possible to tell

Q: "Two boys in black swimming trunks are holding another boy by his arms and legs on a beach." Does this mean that "The boys are playing at the beach."?
A:
yes