the child is most likely to touch his nose. the natural instinct for people when they see something new and bright on their face, is to touch it. this is why we are so commonly known to touch acne if we see a new pimple pop up or to touch and poke at new bruises. when people see new things on our body, especially bright things, we feel the need to touch them, which is what the child would do when he see's the lipstick on his nose.
let me know if you have any further questions
:)