Hello Stephanie3982, I'm ThatOneMushroomGuy and I'll be the TA handling your critique today.

Arrows

Starting with your arrows your lines are looking fairly confident and smooth, which helps communicate a nice sense of fluidity in your arrows as they move through the world. You're keeping foreshortening in mind while constructing your arrows which allows you to make really good use of perspective and the depth of your page, this gives a nice extra layer of tridimensionality to your arrows.

Your usage of hatching helps you establish how your arrows twist and turn in space and further your own understanding of the tridimensional space these objects occupy, it's good that you're making use of added line weight on top of the overlaps in order to reinforce their depth, but don't forget that it must be added subtly to your work, only once, on top of the overlaps, and the ends of the lines must taper seamlessly into the lines underneath, as shown here.

You've done a good job on this exercise, what I'd like to tell you so that can keep getting the most out of this exercise is actually to encourage you to get out of your comfort zone more often the next time you tackle this exercise, try arrows with different kinds of twists and turns and different rates of foreshortening, keep in mind that arrows are very flexible objects and can move freely across the world in all sorts of manners, so you should push yourself and explore the different possibilities.

Leaves

The linework for your leaves is looking smooth which helps communicate their fluidity and sense of energy, it's good that you're not only trying to capture how these structures sit statically within space, but also how they move across it from moment to moment.

However there are also some unnatural bends present in your leaf structures. Keep in mind that even though leaves are very flexible structures, that mostly applies to their length and not their width. They're like a piece of paper, not a piece of rubber, they can fold and bend in a lot of ways, but they can't stretch or compress, and if we try to force them to they'll simply rip apart.

One last thing about your leaves— it's not uncommon for students to confuse what they're trying to achieve when adding marks to the surface of their leaves, as you've done here. It's important that you consider whether you're trying to add artificial contour lines to just help convey how that surface flows through space, or whether you're trying to capture the actual vein texture present along that surface. If you're drawing artificial contour lines, you shouldn't be trying to mimic a branching vein pattern. If you're drawing the veins proper, then you shouldn't be doing so with lines, and should instead be using cast shadows to imply the presence of those textural forms as discussed back in lesson 2.

Branches

Moving on to your branches they are coming along really decently made as you're following the instructions for the exercise, you're drawing your edges in segments which allows you to maintain higher control over your marks and helps you create solid but still organic looking structures.

There are a couple of visible tails present in these branch structures, while this is a very common mistake we can attempt to mitigate it by limiting the amount of ellipses in our branches, by spacing them further apart we'll allow for a bigger length of runway between ellipses, and ensure a smoother, more seamless transition between marks.

In addition to this, you're also neglecting to draw through your ellipses, which you should be doing for each and every ellipse you draw for these lessons. When it comes to your application of the ellipse degree shift to your branches it can be improved, as it stands your degrees are too consistent and hardly change which is a mistake that flattens your structures. Remember that as a form shifts in relation to the viewer, so will the degree of the ellipses within that structure also shift.

Plant Construction Section

And lastly let's take a look at your plant constructions, which are generally coming along well made, as you're following the construction methods and techniques introduced in the lesson which allows you to construct really solid looking and believably tridimensional structures. I can see a good developing sense of spatial reasoning in these pages.

When approaching cylindrical structures such as plant pots and mushrooms, make sure to start with a minor axis in order to keep your several ellipses aligned to each other more easily. Going further don't forget to construct the outer rim that's present in most types of plant pots, and make sure to add a soil plane to your structures, this line is necessary when constructing plant pots because otherwise your structure will look like it's floating in mid air, which breaks the illusion of the construction.

Make sure that you're always drawing through your forms and constructing them fully, I've noticed that in some of your constructions you don't draw through some of your forms, such as leaves or branch like structures, this limits your ability to work through these tridimensional puzzles and limits how much you're getting out of the exercise. Not drawing through your forms means relying on your observation skills, instead of engaging your sense of spatial reasoning and truly trying to understand how the object you're drawing works, where it comes from, what it attaches to.

For your venus fly trap construction there are a couple of changes that you could have made which would have allowed you to create a tighter and more specific structure. Currently you approached the "body" or the "stem" of the venus fly trap as a sort of leaf shape, while this is a valid way to approach this structure it leans too heavily on the side of oversimplification for this part of the plant structure and makes the structure feel fragile, flimsy and flat.

This part of the venus fly trap is actually cylindrical in nature, but it's hidden underneath the more leafy part of the stem, it's helpful to understand this because you can then simplify the forms by capturing this part of the structure as a branch ( which makes it much clearer how the "trap" of the venus flytrap connects to the rest of the structure ) and afterwards build the rest of the structure with the leaf construction method, which will allow for a structure that feels less flimsy and much more solid.

Final Thoughts

In general your work is starting to move in the right direction, you're starting to understand the purpose of these techniques and exercises and developing your sense of spatial reasoning.

I'm going to be marking this lesson as complete. Good luck in Lesson 4.