Starting with your organic intersections, your work here is solidly done. You've done a good job of wrapping the forms around one another, and successfully conveying how they sag and slump over one another where their weight isn't quite supported, creating a believable illusion of mass.

Moving onto your animal constructions, I quite agree with you - your earlier drawings definitely have their issues, and as you work through the set, your grasp of the concepts of the lesson improve substantially. It's definitely not a sudden thing, but instead I think there's an element to your understanding improving, but the confidence that comes with that sense of understanding also pushes you forward, changing the manner in which you put your marks down and ultimately yielding even better results in turn.

As a whole, I think you end up demonstrating a very strong grasp of how your constructions are made up of simple forms, and how those forms ultimately relate to one another in space. You show a good sense of how to employ the additional masses, having them wrap around the existing structure and considering how to shape their silhouettes such that their complexity is focused where they make contact with that structure (where we run up against more inward curves and corners), while maintaining more simplicity (with more outward curves) towards the outside. I demonstrate this concept in this diagram, but we see it at play quite a bit throughout your work.

That's not to say there aren't some issues. As I've pointed out here, you're a little too enthusiastic, and this causes you to put down marks in a sloppy manner. Remember that while we all surely want to be quick and loose and gestural, that is not the manner of this course. Here we take our time, we execute each and every mark with forethought, planning, and purpose. We do this in order to train and develop our instincts, so later we can draw loosely but in doing so still have our subconscious carry the burden of thinking for a split second before execution, and maintaining a strong grasp of 3D space even when we're just jotting things down quickly. If we rely on those instincts here, when we're meant to be training our instincts, we'll end up with more of a mess.

Even in terms of drawing fur, it's incredibly important that you do so intentionally, designing those tufts purposefully rather than trying to let randomness solve the problem for you. And of course, applying the sausage method mindfully, taking care in defining those contour lines at the joints, and so on is critical. I noticed that, likely because you were allowing yourself to be loose, you hadn't quite grounded yourself in the use of the sausage method, and as a result your hybrid drawings, while coming along decently, were missing key components. No contour lines at the joints, for example, to help reinforce the illusion that the structure is three dimensional.

Another page I wanted to talk about was this one, specifically the rhino drawing. Here you jumped back and forth between some particularly faint 'underdrawing' lines and darker marks that were more committed. Construction of course demands that every mark you put down be done so with a sense of commitment, making those marks dark and bold on the page, rather than going out of your way to keep any of them faint and hidden. Remember that the goal here is not the end result - it's the exercise in spatial reasoning, from thinking about how the forms connect to one another, how they relate to one another, and how we can build upon each level to achieve greater construction one step at a time, instead of jumping too far too soon and having our construction falling flat.

In terms of applying construction to the rhino's head, I actually have a demo for that which I did for a student some time ago. I had to dig it up, but hopefully it should help. Ultimately I don't actually think it's necessary - while you skipped a great many steps in that construction, it's not because you didn't know better. It's because you got a little over exuberant.

Anyway, I'm still quite pleased with your results and the understanding you've demonstrated. I do however hope that in the future when exploring this stuff further on your own, you will make a point of pulling yourself back and adhering to the aspects of the exercise itself, in order to reap its full benefits.

For my purposes however, I'll go ahead and mark this lesson as complete.