Billboards: how much does it typically cost to have a child-model’s face on your billboard? Eg: Montessori school, BIG billboard, 3yr old model.
It’s tough to say. Models can have vastly different price points. A quick search, however, and it looks like you’ll be a lot more through an agency vs. finding a model via craigslist. I’d take a look at what others are asking for/offering to pay through craigslist in your area to get a rough idea.
Hope this helps. Sorry I can’t be more specific.