Black woman is posing so an artist can sketch a picture of her.
A black woman is posing nude.
A woman posing for an artist does not have to be nude.
exists e1 p1 x1 x2.(exists e2 p2 x3.(exists e3 x4.(Theme(e3,x4) & Actor(e3,x3) & v_sketch(e3) & of(x4,x1) & n_picture(x4)) & Topic(e2,p2) & Actor(e2,x3) & v_can(e2) & n_artist(x3)) & n_female(x1) & so(e1,p1) & Actor(e1,x1) & v_pose(e1) & n_woman(x1) & (x1 = x2) & ne_nam_black(x2))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_pose(e1) & n_nude(x2) & n_woman(x1) & a_black(s1) & Theme(s1,x1))