Iconography. Iconography is the branch of art history which studies the identification, description, and the interpretation of the content of images: the subjects depicted, the particular compositions and details used to do so, and other elements that are distinct from artistic style.
If you decide you do want to pay your child for completing chores, how much is acceptable? Money Crashers suggests that a good rule of thumb is to pay your child $1 for each year of their age, per week. For example, a 5-year-old who completes all of his chores would make $5 that week.
We currently pay our nanny $18 an hour for two kids (and she makes $14 an hour for one). With your son being in pre-school for part of the time, I would simply pay her the single child rate while he is in school, and the two-child rate when she is watching them both.