A woman dressed in black is silhouetted against a cloud darkened sky.
the woman in black blocked the grey sky on her birthday
A silhouette occurs within the frame of darkness and does not  block it. A cloud darkened sky does not always give a grey appearance. It cannot be inferred that is was her birthday.
exists e1 e3 e2 s1 x1 x2 x3 x4 x5.(against(e2,x4) & n_sky(x4) & Theme(e3,x4) & v_darken(e3) & of(x4,x5) & n_cloud(x5) & Theme(e2,x1) & v_silhouette(e2) & Theme(e1,s1) & Theme(s1,x3) & a_black(s1) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_woman(x1))
exists e1 x1 x2 x3 x4 x5.(n_birthday(x5) & of(x5,x1) & n_female(x1) & n_sky(x3) & of(x3,x4) & n_grey(x4) & n_woman(x1) & Theme(e1,x3) & Actor(e1,x1) & v_block(e1) & on(x3,x5) & in(x1,x2) & n_black(x2))