>>11384722
I think the girl being barefoot while mummified or even in bondage in general is more than just an afterthought of "might as well leave it exposed" for tickling. Her feet are one of the most sensitive parts of her body so it'd make sense to be a deliberate choice. Outside of tickling fetish which isn't that common, because of the associations of being barefoot, it makes her look more vulnerable and submissive.