Tyra Banks is saluting Vogue’s 19 international editions for pledging to promote healthy body image, but she says real evolution will take some time. “Real progress is finally on the horizon,” Banks writes in an open letter on The Daily Beast. “Vogue is stepping up, doing the right thing, and protecting that girl. Perhaps that girl is you!” Earlier this month, Conde Nast, which owns Vogue, announced a six-point plan for what they’ll require beginning with their June editions. “Vogue editors around the world want the magazines to reflect their commitment to the health of the models who appear on…