Q: "One adult and three children gathered on the floor looking at a picture on a digital camera." Does this mean that "No one is looking at a picture."?
A: no

Q: "The woman in black while playing guitar, steps up to the microphone and sings." Does this mean that "The sad woman in black while playing guitar, steps up to the microphone and sings."?
A: it is not possible to tell

Q: "A woman with scarf on her head planting seeds." Does this mean that "A woman is planting seeds."?
A: yes

Q: "a man sitting on the floor crying while another man is trying to comfort him." Does this mean that "A man is upset"?
A:
yes