She has the most awkward smile.
It looks like she smells something bad in every picture and is trying to hold it in.
https://mlpnk72yciwc.i.optimole.com/cqhiHLc.WqA8~2eefa/w:357/h:535/q:75/https://bleedingcool.com/wp-content/uploads/2018/02/Jeanine-Mason.jpg
https://www.gotceleb.com/wp-content/uploads/photos/jeanine-mason/entertainment-weekly-people-new-york-upfronts-party-in-ny/Jeanine-Mason:-Entertainment-Weekly-&-PEOPLE-New-York-Upfronts-Party-03.jpg
https://m.media-amazon.com/images/M/MV5BNTY2NTUwNzY2NF5BMl5BanBnXkFtZTcwNzMyNTQ1OA@@._V1_.jpg
https://www.famousbirthdays.com/faces/mason-jeanine-image.jpg