The man is wearing an orange and black polo shirt and is kneeling with his lunch box in one hand while holding a banana in his other hand.
A man is eating lunch.
holding a banana in his hand signifies the man is eating his lunch
The act of holding a banana implies that the man is eating it. The reference to a "lunch box" being present while the man is eating implies that he is eating lunch.
the man  kneeling with his lunch box is for eating lunch