Starting with your arrows, these flow very nicely and fluidly through space and convey a strong sense of motion to them. You do however need to keep an eye on how you apply perspective not only to the positive space - the width of the ribbon getting narrower as it moves away from the viewer - but also to the negative space - that is, the gaps between the zigzagging sections. These empty gaps should be getting tighter at the same rate at which the ribbon gets narrower.

For your organic forms with contour lines, you're generally doing a decent job of sticking to simple sausage forms, although do keep an eye on the curvature of the ends of the sausages. We want them to be circular in nature, some of yours tend to get more stretched out.

Your contour ellipses are generally decently drawn, though in the interest of accuracy (which you manage well), you make sacrifices in the confidence with which they're drawn. Drawing them confidently is always the first priority, and is going to be more important even if sacrificing accuracy as a result. Drawing them confidently achieves a smooth stroke and an even shape, whereas right now they're definitely a little more hesitant and stiff. Conversely, your contour curves are a touch more confident (still could be a bit moreso but they're definitely better). You're also doing a great job here of showing how the degree of your contour curves shifts from wide to narrow or narrow to wide over the length of the form - something that is lacking a little from your contour ellipses.

Moving onto your texture analyses, these are fantastic. You've clearly bought into the use of clearly designed shadow shapes, and on focusing on capturing the shadows the textural forms themselves cast, rather than outlining forms in an explicit manner. As a result, you've not only exhibited exceptional attention to detail and observational skills, but you've also achieved really nice transitions from dense to sparse.

This carries over nicely to your dissections, and you've avoided the tendency of some students to get caught up in outlining their more discrete forms, and instead continued to demonstrate really nice transitions throughout. Very nicely done.

For your form intersections, these demonstrate a confident use of the ghosting method behind each and every line, and in turn, forms that are constructed to be consistent and cohesive with one another within the same scenes. You're also showing a great start on the intersections themselves, and a nicely developing grasp of how these forms relate to one another in space. Spatial relationships are the concept that we're introducing here - we don't expect students to have prior experience or any level of comfort with them, but rather want them to make an attempt so as to provide them with some exposure to the principles involved. This will allow us to continue exploring these concepts in later lessons, to further develop that understanding.

Lastly, your organic intersections are also very well done. You've done an excellent job of capturing how these forms interact with one another in 3D space, and have created a strong illusion of gravity in how they slump and sag over one another.

All in all, your work throughout this lesson is very well done. I'll go ahead and mark this lesson as complete.