Overall I feel you're moving in the right direction overall. Your leaves exercises are well done, and your american bittersweet is solidly done as well. For the butterfly bush however, you ended up taking a wrong turn. From what I can see, you identified the great increase in complexity to what you were trying to draw, and decided that this should be approached in a different manner to simplify the problem.

Unfortunately an increase in complexity does not inherently imply that a different approach should be used. Sometimes a drawing is just more demanding, and either you need to give it as much time as it individually requires (in this case to construct each petal on each flower using the methodology shown in the instructions), or you simply need to pick a different kind of plant.

At least, that's for the purposes of what we're doing in this course, where each drawing is an exercise in spatial reasoning. The goal is not to simply produce a replica of your reference image - it's about applying the assigned procedures in order to help further develop the way in which your brain thinks through 3d space.

That's not to say that there aren't situations where you could tackle this one with a greater focus on texture - that is, treating the structure itself as though it's a simpler cylindrical structure, then focusing only on drawing the shadows that the petals would cast upon one another. I should be clear though that this isn't just a matter of putting down random marks and hoping to capture the "impression" of those petals - rather, it'd require you to think about and understand the nature of each individual petal, and how they relate to the other surfaces around them, so that you can design each individual cast shadow based on that understanding. This would actually be harder than simply tackling each petal with construction.

What you did here was more a matter of approaching it with explicit marks (so not the implicit markmaking we use for texture) but without holding to the core principle of construction, being that we start as simple as possible and build up complexity in successive stages.

Anyway, I'm not going to assign additional revisions over that, as overall I can see that you're headed in the right direction. Just consider the references you choose to work with. There's no shortcuts in this course, and so if you pick something that has a thousand tiny flowers on it, that's inevitably going to mean a ton more work for you.

You may consider this lesson complete.