So you may have forgotten what it means to 'draw through' ellipses, because it's much simpler than that - although to be fair, we do use the term "draw through" for two independent things, which obviously lends to the confusion. In the context of drawing forms (like boxes), it means drawing as though we have x-ray vision, so we can see all of its edges, including the ones that are blocked from view. So for example, in terms of what I mentioned about your clusters of flower petals or groups of leaves, I'd want you to "draw through" them (in other words, draw each one in its entirety, not cutting them off where they're overlapped by another).

In the context of ellipses however, I'm referring to what's explained here in Lesson 1 - the idea of simply drawing around the ellipse two full times before lifting your pen.

Hopefully that clarifies things.