A young redheaded girl in a blue shirt is walking and talking with a boy in black Pearl Jam shirt.
A couple of young people are at a concert.
the people walking don't have to be at a concert
A young redheaded girl in a blue shirt is walking and talking with a boy doesn't imply that they are a couple.Not all young girls and boys walking and talking are at a concert.
A girl talking to a boy does not mean they are couple.