Before I get into the critique, I'll go ahead and answer your question. The answer kind of depends. As far as we're concerned here, the way you tackled it with the peony is correct, because this course is not about how to create pretty beautiful drawings. Each and every drawing is an exercise focusing on developing one's spatial reasoning skills. To that end, our drawings do sometimes get heavily layered with a forest of lines - but looking at your peony, none of them are messy. Each line is drawn purposefully, so you're on the right track.

Now, there is an alternative approach to capturing information that can otherwise get too dense - texture. You can opt to use textural techniques (specifically implicit drawing techniques focusing on the shadows a form casts on its neighbouring surfaces) to avoid having to actually construct everything in its entirety. This works best when the forms we're looking at follow a particular larger surface - the peony for example forms something of a ball, so you could treat the petals as though they were a texture covering a ball form. This is something that also can be useful when drawing treetops, where no one is expected to draw each and every leaf.

Just keep in mind the purpose of the exercises - for our purposes, attacking the peony as you did is appropriate.

So, starting with your arrows, you've drawn these with a good sense of confidence and fluidity. You got the hatching a bit backwards in the bottom one at one of those turns but generally these are coming along well. That same sense of motion carries over very nicely into your leaves, capturing not only how they sit in space, but also how they move through the space they occupy.

One thing I do want to mention in regards to your leaves however, is that here you seem to be approaching construction as though each phase is an opportunity to fully redraw the entire edge each time, steadily making your line weight darker and darker. Instead, as shown here on another student's work, you should only be drawing the part that changes from one step to the next. This issue is similar to the one explained here.

Similarly, looking at cases like this one, it's important that you understand that each step of construction asserts some truths or provides some answers about the object you're constructing. It is important that once these answered are given, you do not contradict or undermine them. So, for example, the larger leaf shape defines the outer extent to which the smaller leaves' flow lines reach. They don't fall short, or extend past it - they go right to that outer edge and stop. Similarly, the flow line of a leaf gives us the length of that leaf - we don't leave an arbitrary distance between the end of the flow line and the leaf's actual tip - they're to be tightly bound. In some of these leaves, you end up with a sort of loose, vague relationship between constructional steps that definitely needs to be tightened up.

Moving onto your branches, these are mostly looking great, just be sure to fully extend each segment halfway to the next ellipse. This is important because of how it provides a more significant overlap between segments, allowing us to flow more smoothly and seamlessly from one to the next as shown here. Aside from that, you're doing an excellent job here.

Moving onto your plant constructions, I think you're largely knocking these out of the park. You've definitely improved in regards to tightening up the relationship between your different phases of construction, and you're showing a great deal of respect for the constructional approach as a whole. Your constructions feel solid and believable, and you pay clear attention to your references to inform each choice.

Aside from the points I've mentioned already, I have just one very minor suggestion - when drawing anything cylindrical, like a flower pot, which has loads of ellipses, be sure to construct it around a central minor axis line. This'll help you keep all those ellipses aligned together (though you've largely done a good job with that already).

I'll go ahead and mark this lesson as complete. Keep up the great work.