Looks nice, it seems you read carefully the instructions and took your time. Congrats! But normally, there are some issues here that you should be aware of.

Arrows: I'm only going to comment the second page, as it seems you realized and corrected some of the mistakes you made in the first page. The main problem I see is how you're applying line weight. You apply too much, and you apply it incorrectly. The difference of line weight should be subtle to not divert the attention from the arrow as a whole. And by applying it incorrectly, I mean that you're chicken scratching instead of going over the lines confidently and in one pass. Confidence before accuracy.

Sausages: try varying even more the the degree of the ellipses to make them more three dimensional, especially in the contour sausages because right now they're looking quite flat. Also, some ellipses are not well aligned to the axis, be careful with that because one bad ellipse really kills the illusion of space. In terms of line quality, I see some wobblines, again especially in the contour sausages.

Texture analysis: I'd recommend to take more time with the squares in the left, both to fill them to completion (you left blank spaces in the tortoise shell texture) and to look more carefully to put in more detail (they're all quite simplistic).

About the right side, the main problem I see is the lack of an actual transition. The black bars are too evident. In the tortoise shell texture, you transition to full white too quickly.

Dissections: I don't see scratching/scribbling (which is very good) but they still look messy. Why? Because the edges of the black areas/shapes are too irregular, it's unnecessary and meaningless noise that distracts and confuses the viewer. To make them smoother, try outlining the area you want to fill and then fill it. Also, fill properly with black, I noticed some black areas have plenty of white spots. This looks bad exactly for the same reasons as the edges.

Intersections: fill more the pages! You'll both save paper and learn more hahah. Once again, I see wobbly line weight. Lastly, the cylinders are too long. Stick to roughly equilateral forms. Why does this matter? I think it's because this way all the forms will have not too different foreshortenings which makes it easier to understand the scene.

Organic intersections: again, fill better the black areas and keep their edges smooth! Moreover, you're using the same contour lines as in the contour sausages. Here in this exercise we use another kind of contour lines, here's a link to its text section (https://drawabox.com/lesson/2/9/step2). I also find the sausages a bit rigid, and I feel like the reason is that you could be exaggerate more the effect of gravity, how it makes the sausages dangle.