The only number that decides a face painting booking is faces per hour, and almost nobody asks for it. A Sydney birthday with thirty children and one painter booked for two hours ends with a queue that never clears and a handful of kids going home plain, so take your guest list, add the siblings who tag along uninvited, and divide by whatever the painter tells you they manage.
Before any of that, settle the clearance. Ask which working with children check the painter holds in New South Wales, ask for the number, and put your own eyes on it, because we list performers here and verify none of them, so a profile on this site proves nothing about anybody. A painter who does school work keeps the card in the kit and hands it over without taking the question personally.
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New South Wales runs its own clearance scheme and anyone doing paid child-related work is expected to hold it, so ask which one the painter has and sight the card or the number yourself. A painter who travels across the border for Canberra or Queensland jobs may hold more than one, which is normal. Nothing on this site is a substitute for looking at it, because we do not verify anybody.
It depends almost entirely on the detail, so make the painter give you their own number at each level rather than accepting a general answer. Then divide your guest list by it and see what the clock says. Where the sum comes out longer than the party, either add a second painter or simplify the designs, because the youngest children lose patience first and drift off without ever reaching the chair.
Professionals use cosmetic grade paint made for skin rather than craft paint, and they will name the brand without hesitating. Ask what they do with brushes and sponges between children, and whether they can patch test a child who reacts to things. Warn parents in the invitation too, because it washes off with soap and water but glitter stays in a house for a week.
Painters charge by the hour with a minimum booking, and the rate holds fairly steady whatever they are painting, so the real cost per child comes down to speed. The part people miss in a city this wide is the driving: crossing from the northern beaches to the south west and back consumes most of a painter's day around a two hour job. Ask for the call-out figure up front and the quote stops moving after that.
Full faces are slow and small designs on a cheek or an arm are quick, and the gap between the two is enormous over an afternoon. Settle the menu at booking and the queue maths works out before anyone is standing in it.
Sydney sun makes paint set badly and turns two hours into an ordeal for whoever is holding the brush. Pick a covered spot with a power point nearby for the light, and tell the painter where it is before they arrive.
A school or community day is an open ended line rather than a guest list, and the good painters already have a numbered ticket system or bring a second pair of hands. Sydney councils and school offices will also want their liability cover on file, so collect that paperwork when you book instead of chasing it in the final week.