So far everything seems to be in the clear

Arrows:

You seem to be employing perspective in your arrows which good using shrinking and growing in tandem with the arrow's direction

Sasuages

The biggest problems seem to be with your orientation and number of ellipses. When doing contours you want to minimize the number of ellipses use this because when your orientation off it can threaten the scanitity of the illusion, and can confusion. This doesn't seem to be too much of a problem on your full ellipses howeever this is more pronouced on your half-ellipsies.

Texture:

Now the texture is much more tricky for me. Because it's harder grasp weather or not you have gained an understanding of the main the idea. While you are breaking the shilouette which is good, you some times fail to properly wrap the texutre around the form. The biggest issue is your use of detail. The whole point of this exercise is about implicit detail(cast shadows), where the form blocks light. When using caste shadows the goal should to creat the impression of the form. But the problem with you seem to be to much explicit detail It's muddling up your work. For example the pangolion shell has in my opion to much shadow in some area's which makes it seem like you're drawing each shell explicity. Other times you have the mink fur where you scribble around aimlessly, and Then you have the sasuages where you seem to grasp the concept better. like the stawberry. Here you are drawing the shadow around the seeds. which is what you should be doing.

Form intersections:

The biggest problem with your form intersections was on your first page with just squares You seem to grasp the idea of form intersections as you go on, however to to clraify when using form intersections you must show where the surfaces of both forms intersect and how that intersection relates to one of the forms. Which you seem to be doing however you seem to be overdoing and showing the form inside the other is is undermining your work.

Lastely is your orgnaic form intersections which suffer from the same problem as your sasuage half-contours.