it's not, pron is in all actual defenition is, sex/the act of sexual behvior!!!!
that pic is slight nudity at best, if it showed her in pants while like that or just undies like that, as long as the lower part isn't nude or shown, it can't be considered pron!!!!
for example{you go to a nude beach, every one is nude [partially and fully], partially they eighther have only bottoms on or tops only, but it's not pron unless there's sex, that's why those beaches have signs everywhere saying no sex allowed}, also you don't get onto men for/consider it pron when men have/having nothing covering thier chests!!!!
so don't be sexist, saying only men can do that but girls can't, also this icon
of yours is no different than my pics!!!!