A boy in a red shirt is squatting in front of a circle of stones with a pot in the middle.
A boy prepares a camp fire spot to make his dinner.
A boy just sitting in front of a circle of stones with a pot in the middle does not mean that he prepares dinner in that spot.
The boy could be making the camp fire for reasons other than to make his dinner.
Noting it's a camp fire is more specific and saying it's his dinner shows it's not a different meal or another reason to use a pot.