A woman posing for a picture.
A woman is taking a selfie
Posing for a picture has the implication of taking time to script the picture, which taking a selfie implies a quick unscripted picture.
exists e1 x1 x2 x3.(a_topic(x1) & for(e1,x3) & n_picture(x3) & Actor(e1,x2) & v_pose(e1) & (x1 = x2) & n_woman(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_selfie(x2) & n_woman(x1))