Hello attila, I’m ThatOneMushroomGuy, and I'll be your TA for this critique.

Arrows

Your arrows have smooth, confident lines, and you’re using foreshortening effectively to create depth, which gives them a strong sense of tridimensionality. The use of hatching helps define how your arrows twist and occupy space. Additionally, you’ve used added line weight well to reinforce depth.

Overall you've done really well in this exercise, your arrows look very tridimensional and you're exploring the space available to you, but make sure to experiment with more different kinds of arrows next time you attempt this exercise, while your arrows look good they also look very similar to each other, arrows are very flexible objects and as such ther's a myriad of ways they can fold, twist, and overlap as they move through the world, so make sure to push yourself out of your comfort zone and explore all the different types of arrows possible in order to develop your spatial reasoning skills further.

Leaves

Your leaf linework is smooth, conveying a nice sense of energy. However, most of your leaves don't fold or bend, which is something to focus on moving forward. Leaves are organic and affected by various forces such as wind or gravity pulling them down, so consider their movement in space rather than just their static shape.

It's good to see that you've experimented with complex leaf structures but remember not to skip construction steps when approaching these more intricate structures.

This structure is looser than it could be, because you skipped construction steps and tried to capture the complex form of the structure right away, instead of constructing each individual arm with the leaf construction method and only then connecting them together. Even though leaves are single entities they can still made be made up of several parts.

For edge details, slow down a bit and give each mark more attention. Right now, some marks have gaps or zigzags, which is a mistake be avoided with more time and care. No mark is unimportant, so make sure each one is as clean as possible.

Branches

Your branches are coming along well, but there’s room for improvement. Make sure your line segments extend fully to the halfway point between ellipses to achieve a smoother overlap between your marks.

You should also attempt to limit the amount of ellipses in your branches, by spacing them further apart you'll allow for a bigger length of runway between ellipses, and ensure a smoother, more seamless transition between marks.

You’re drawing through the ellipses twice, which is great, but your ellipse degrees are too consistent. As forms shift in space, the ellipses within them should change degrees accordingly to avoid flattening the structure.

Plant Construction

And lastly let's take a look at your plant constructions. Overall, you're following the instructions to the techniques introduced in this lesson to great effect. You're starting to understand the purpose of these exercises and develop your spatial reasoning skills, but there are some things which must be addressed - not all of them are outright mistakes, but they are holding you back from your full potential and from getting the most out of these exercises.

Make sure to keep all stages of your construction tight and specific, don't leave gaps in between stages of construction, such as a leaf's flow of line and it's outer edges. Otherwise your construction will be less solid than it should be, such as in here, where you don't clearly define the way the leaves attach to the stem of the structure, which makes the structure look looser than it could be.

This is also true in this flower construction where you deviate from the construction methods by not starting your branches with a minor axis and by not drawing through your forms.

Your mushrooms could also use a clearer and more defined construction for the cap of the structure. Currently you use only a single ellipse shape to define the structure, but ellipses are two dimensional shapes, by themselves they will flatten a structure.

Keep in mind that mushrooms are cylindrical structures, this doesn't apply only to the body of the plant but also the "cap", some have a flatter cap, while others have a sort of dome shape. Regardless, you should construct it fully as shown in the king oyster demo, using at least two ellipses to define the tridimensionality of the structure - the base that will attach to the body of the mushroom, and the top part which defines the edge of the structure.

Its strongly recommended that you do not draw earlier phases of construction with fainter lines and later ones with thicker strokes, as this is going to encourage you to approach construction as though you're redrawing everything at every step. This is something that happens quite frequently in your work, even if unintentionally.

When drawing something with construction what we're doing is adding building blocks at each different step, using our first forms as a foundation in order to simplify our structures. In this way there's no need to alter that foundation, it should be able to stand for itself when you're done, without being redrawn, traced over, or having it's silhouette modified with 2d shapes on to of it.

Instead, we're simply building upon the existing structure, modifying what's already there at each stage. There are things that simply won't need alteration, and therefore the marks that defined them from the start should be able to stand for themselves when you're done, without being redrawn or traced over needlessly.

You should also ease up on your lineweight, it's thick, with several passes going over the same marks and jump from one form's silhouette to another, which smooths everything out too much. Almost as if you pulled a sock over a vase, it softens the distinctions between the forms and flattens the structures out somewhat.

Instead lineweight must be subtle, used only to clarify the overlaps between the forms that are being built up, as explained here.

Final Thoughts

In general your work is looking really good, you're starting to understand the purpose of these techniques and exercises and making use of them in your work effectively, as such you demonstrate that your sense of spatial reasoning is developing really nicely.

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