She does look angry i think that she is taking her boots off under duress sort of not wanting to and getting angry,with herself for sucoumbing to the temptation,. but at the same timenervously curious, note the pouting lip.
I think the other pics on the site revolved around someone worshipping her feet.
i guess we could put any number of captions on these pics i have a try and wait to see what others think