Starting with your arrows, these are drawn such that they flow very fluidly through space with a strong sense of movement. One thing that does need work however is your use of perspective. You are applying perspective to the positive space of some of these arrows (that is, making the ribbon get narrower as it moves farther back), but you appear not to apply it to the negative space - the gaps between the zigzagging sections. Foreshortening compresses all space, resulting in both the size of objects diminishing as they move away, as well as the distances between objects getting smaller.

Moving onto your organic forms with contour lines, you've clearly made a significant effort to stick to simple sausage forms as noted in the instructions. There are a few small deviations from this (usually just the ends being of slightly different sizes or very slight pinching through the midsection) but all things considered, you've done this well. You've also drawn the contour ellipses to be smooth and evenly shaped, you've wrapped the contour curves around the forms convincingly, and you're showing a pretty good grasp of how those contour lines' degrees get narrower or wider as we slide along the length of a given form.

Looking at your texture analyses, I think it's clear that you've taken the principles covered in this exercise's instructions, as well as the texture section of the lesson, to heart. You're focusing very heavily on drawing cast shadows rather than outlining forms, and as a result are doing an excellent job of implying the textural forms present on the surfaces of your object rather than drawing each form explicitly. You're also demonstrating well developing observational skills. The only area where I think you're falling a little short is in achieving more gradual transitions from dark to light. All the pieces are in place, all you need to do is be more willing to allow the shadow shapes to expand as we move from right to left. Think of it like how a droplet of dye in water will gradually spread out over a surface - those shadows aren't limited to a certain size. Depending on the light source, those shadows can certainly get broader and wider, spreading out until they fuse with other neighbouring shadows to create even larger shadow shapes. The second row - the leaf texture - has loads of smaller cast shadows along the left side, but you end up jumping from those to that very large swathe of black on the far left. The shadows should have been growing steadily, rather than jumping suddenly.

Anyway, this is still very well done, and you're showing a well developing grasp of how this all works - just need to push yourself a little further, and that will come with practice.

Throughout the dissections you certainly experiment with a number of other textures - some of them continue holding to the same principles (like your fish scales) where you're focusing entirely on implying the presence of those scale forms, whereas others - like the bricks - end up falling back to more explicit drawing techniques such as outlining those forms entirely. While I think you understand what went wrong there, be sure to give these notes on the issue a read anyway. Same thing applies to your spaghetti texture - you really always want to focus only on shadow shapes, not on outlining forms.

Moving onto your form intersections, I think you've got a great start here. You're doing an excellent job of drawing these forms such that they feel cohesive and consistent with one another. You're also starting off with the intersections themselves quite well. These intersections serve as a first introduction to thinking about how these forms relate to one another in space, and actually clearly defining these intersections with contour lines that run along their shared surface. I by no means expect students to have any experience with this in the past, nor to be particularly successful. You've doing quite well all things considered however, and you'll continue to develop your grasp of these relationships as we explore these concepts throughout the rest of the course.

Lastly, your organic intersections are coming along reasonably well. I do have a few mild concerns - for example, be sure to stick to simple sausage forms that don't pinch through their midsections, don't forget that the whole pile is resting on a surface (and therefore there should be a cast shadow beneath), and so on - but all in all you're doing pretty well. You're capturing how these forms interact in 3D space, and creating an illusion of gravity in how they slump and sag over one another.

All in all your work throughout this lesson has come along well. I will happily go ahead and mark this lesson as complete, so keep up the good work.