You have a very good showing here. Lines and strokes are confident, the textures are clean, and the solid forms feel solid. To get more specific...

-Arrows

The perspective here is handled well. Arrows get bigger as they get closer, and the spacing of the curvature gets smaller as it gets further away. The only remote issue I see is that some of the hatching lines go a little outside of the arrows they are drawn on, but this is not a consistent issue.

-Organic forms with contours

Your organic forms are solid, but there's still room for improvement. On some of them, the degrees of the curves don't seem to shift very much, if at all. It's important to get this for conveying the fact that this form is present in a 3D space with 3D perspective. You should be able to get this with practice. In terms of smaller things, some curves either don't reach the edge of their respective forms or go past the edge on occasion.

One final thing: While you actually handle it pretty well here, don't be too eager to make sausage forms where the ends are different sizes. It's best to keep them simple for practice's sake. You do a good job portraying it as exaggerated perspective, but still, simpler is better. Just keep this in mind.

Aside from these things, your organic forms are quite good. You seem to be drawing them with confidence and have done a good job with elements like keeping the ellipses' minor axes aligned to the spines and making sure your contours adhere to the forms.

-Texture analysis

You've done a great job with analyzing these textures. You seem to be focusing on drawing shadow shapes and making purposeful strokes with your pen, whilst analyzing your references carefully. The gradient section features very smooth transition from dark to light throughout, which is impressive and respectable.

Now, that being said, there is a weak point here. On the feathers texture, you did initially seem to focus more on using lines to portray some of the texture on individual feathers. You strayed away from this on the gradient section, but still, do try to stay away from doing this. Even for the smallest shadows where a line may seem appropriate, try to make it a shape of some sort. Still, you did a great job here overall.

-Dissections

The same strengths displayed in the analysis section are displayed here. You've analyzed your references carefully and done a solid job with focusing on shadow shapes. There are some instances where you use lines, and the same criticism for before applies here as well.

Another thing that you did well is applying the textures to the forms. They break silhouette in most cases, and they clearly follow the curvature. The one exception that jumps out to me is the waffle texture on the second page. It looks flat on the section it was applied to and doesn't really look right. Aside from that one texture, everything here is quite good.

-Form Intersections

Your forms all feel like they occupy the same space, which is the main goal here. The perspective on all of them feels consistent for the most part. Your intersections are quite good as well. You've done a good job of making sure that they adhere to both shapes involved in said intersection. My main issue here is that you could have used some more lineweight to add clarity. Amidst all the forms joining together, it can be hard to tell what exactly is happening. You've applied a little to the intersections themselves, and the hatching certainly helps. I still think a bit more line weight in some places, like on the "visible" lines of the boxes or some heavier weight on the intersections, would help.

-Organic Intersections

This part is done very well. All the shadows stick to the forms they're cast onto fairly well, and the forms all feel like they are properly resting along one another. You've also done a good job keeping the forms relatively simple here. The main issues are just a couple of relatively small ones: the top form on the second page has contours that don't convincingly shift degrees, and shadows of the forms on the "floor" of the first one don't merge together as much as I would have expected. Also, again, I think some more use of line weight for clarity would be good. Using it on edges of some forms to distinguish which organic forms are in front of which is helpful for this.