notice how they moved away the foliage so we can see the main stem. also they focused on the top of the plant, where the signs of sex first show
(this picture is of a male plant)
when taking the pictures try and capture the image of either balls(male) or hairs(female). if you cant see them with the eye, then they are not ready yet, and we wont be able to tell either
again, male;
and female;