thrifting thrifted

So this little [preloved aka sorta scratched] lunch box fell into my path [or I could say lap, cos you know lunch box, sitting down, laps, geddit?] only the day after my last post about vintage smiley badges, and putting on a happy face. Someone was smiling down on me I guess. Or it was just a happy accident. Anyway it was cute, it was smiling, it was there and it was a buck. Sold.
Might not be pink enough for Miss Lily but I’m sure I can find something to put in it. God knows I have enough stuff…

Can someone tell me how you do the yellow smiley face please please please?