Artist's commentary
Ougi-chan drinking a tapioca milk tea
This makes Ougi seem more like a high-school girl.
It's not related, but here's a conversation with a real-life friend↓
(While looking at Owarimonogatari 1's illustrations)
Me: "From this Ougi-chan's smiling face... she's the heroine, no matter how you look at it"
Friend: "I'm pretty sure she's a scheming chess master, no matter how you look at it."