Here's your critique me lad.

Organic Arrows

Overlaps: Followed as recommended. One was quite wonky and unfinished but overall you made them with no hesitation.

Perspective: You applied it pretty well, you attempted the space compression idea on most occasions but in some arrows you made the width of the arrow inconsistently (thicker, thiner then thicker again), making it feel as if the arrow thins out on the end rather than being closer. To put it simply, what is closer to you seems bigger than what is further away, you are representing an object with even size that is moving closer or further from the viewer, the object will gradually change from (seemingly) bigger to smaller or vice versa as it moves through that space. Nailing that line down is hard, but it is something to keep in mind during this exercise.

Line Weight/shading: Your line weigh goes a little bit overboard as it is something to be used rather tamely and just enough to show what is over what, there is also some chicken scratching which mostly happens when trying to correct a line that went wrong and doing it again and again until it becomes a cluster of lines, whenever you have an issue with overlapping lines properly simply calm down and focus on doing it correctly without rushing, then simply move on instead of making it more stressful for yourself, drawabox is to embrace mistakes to the fullest. With the shading it seems that you simply used random lines instead of putting much though to them, avoid randomness and think of how that line is supposed to interact with the arrow, use straight lines that follow it's form. Random woobling will only lower the solidity of the arrow.

Organic Forms With Contour Lines

Sausage Shapes: Keep them simple. You seemed to be pretty inconsistent with the sausages on most instances having them tampering or being to elongated, simple sausages help you understand the main focus of the exercise with no deviations such as having to think how the contours apply to a complex object, starting simple and easy is the foundation of going into complexity. Practice them on your warmups keeping the instructions always in mind. Some sausages you made are pretty good, look at these and study how you made them.

Contour Ellipses: You applied degree change only on a few sausages and very sparsely, also the thinner ellipses are placed mostly in the middle part of the sausage since it's angle is more in front of the viewer, as it moves to the side it seems bigger, as demonstrated here, of course there is rotation on the sausage form but the principle still applies.

Contour Curves: You applied the instructions very well, your lines curve around properly and follow the minor axis. I do want to say that your lines here lost considerable quality and in some it seems you've made the curves in two lines rather than one confident stroke. Ghost your lines, be patient and not afraid of making mistakes because they will happen, if you feel a decrease in quality, take a break and get back to it when you feel focused enough. Another thing is that you overdid the contour curves, spread them more and mostly when there is a evident change in the minor axis's direction.

Texture Analysis

Left Part: You did this area pretty good overall, there is no outlining, you only adressed their shadows and they have a good flow to them.

Right Part: You seemed to struggle to put the shadows on the drawing, on the paper for example it went from smooth to rough edges. It also lacks some smooth transition from dark to light, the area to the right is supposed to be all white aswell. Do not be afraid of working on high amounts and detail to the left and very sparse on the right, it will give the desired effect as demonstrated here.

Dissections

Curvature and silhouette: You kept these in mind, there could have been more curvature to nail down the idea of it wrapping around the object. For the silhouette remember that what is further away is smaller so you will only be viewing a tiny part of a particle that is to the sides of the sausage. So mind the curvature

Texture: You forgot to work implicitly there is supposed to be a lighter level of detail on the middle area of the sausage as if its close to a flashlight, there's going to be few detail where it's pointed and deep shadows in it's side. This lesson is quite outdated but that is something mentioned in the video.

Form Intersections

Intersections: I coudn't most of the time understand where you adressed the intersections, some are correct but in most cases it seems you did not know what to do. For future reference adress this amazing resource that can solve most of your issues here.

Line Work: You should have added more line weight to adress which shapes are over which and hatching on the faces that intersect.

Organic Intersections

Forms/parallel: Your forms were quite simple with few streching or tampering, it seems you have a good sense of space and how the organic forms lay on one another.

Shadows/Line Work: Your shadows were fine and followed the curvature of the forms. Line weight was also good enough with only few scratching here and there, remember to work confidently.

Conclusion

Your work here was pretty much like any other student's, fails and successes. I will give you some revisions regarding form intersections, contour lines and arrows as they are valuable exercises to know how to do correctly. Also I noticed you are working on a sketchbook, this is not the recommended material to use as it's paper breaks pen's nibs more easily and do not give you much freedom overall. Use regular smooth printer paper as instructed.