It is ok for kids to work in the holiday or maybe once a week.
But not as house labour.
In Germany children are allowed to carry out newspaper from the age of 12.
They are are allowed a part time job from the age of 16.
But not more than 8 hours a day and not more than 5 days a week.
Not after 10pm and no overtime.
If it is not a hotel  they are not allowed to work weekends.
And they do not pay tax.(If they are still in school.)
Models they have them at all ages i do not know what laws  they have for them.
Nothingwrong with child models as long as they are treated right.
That is enough break inbetwen.
But the parents are the people tohold to ransom if at all because you that are snaping your one ortwo pic do not know how often the parents take their kids for such shootings.

Lets wage a campaign back home to raise awareness on child labor aka househelps.