Interested sellers will have to create a seller profile to start posting their pictures.
In fact, people have been buying feet pictures longer than you can think of.
Accept cash by PayPal to ensure anonymity.
So, the only way is to publicly comment with your contact details like email address or website something they can use to contact you to buy feet pics.
The best way to go about this is to create an account and stary by creating short videos with your feet.
And this includes pictures of feet.