A person wearing a blue hat takes a photo in the snow.
A man in a hat taking a picture.
A man is a type of person (but a person is not necessarily a man); since he is wearing a hat, we can say he is in a hat; 'taking a picture' is an expression synonymous with 'takes a photo'.
exists e1 e2 s1 x1 x2 x3 x4 x5.(n_snow(x5) & Theme(e2,x4) & Actor(e2,x1) & v_take(e2) & in(x4,x5) & n_photo(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_hat(x3) & a_blue(s1) & Theme(s1,x3) & (x1 = x2) & n_person(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_take(e1) & n_picture(x4) & (x2 = x3) & n_hat(x2) & n_man(x1))