Hiya! My name is Keisari(42) and I'm here to offer you some thoughts on your submission. Before getting into it, great job getting Lesson 2 done! You've reached farther than the vast majority of people who try out Drawabox, and I'm hopeful you'll go on to finishing the whole thing.

Thinking in 3D

Your Organic Arrows frankly look pretty darn amazing. You're doing great in pushing their foreshortening and exploring 3D space and having them behave accordingly, as well as applying line weight and hatching properly. The main thing I have to point out is that you seem to sometimes be repeating your marks, which should not be done at any point in the course; working with your mistakes is one of the main ideas Drawabox attempts to teach. Another thing I'd suggest is that you should abide a bit more to the fact that each curve of an arrow is but shifted copy of the opposing one, just being stretched by the way perspective works. This image by user betweenskyandsea explain this nicely.

Your Organic Forms are also excellent. They're very well constructed, nicely smooth and confident, and you've shown a pretty good understanding of the way the degree of ellipses shifts as they move through space. I have nothing to add.

Texture and Detail

All of your work in this section of the lesson looks excellent, and I really have little to nothing to say. You're mainly drawing cast shadows rather than outlines and thinking in terms of shapes rather than lines, your marks are very purposeful, you're able to convey texture amazingly well even with the limitation of only being able to use two values, the transitions on your gradients are seamless, you're taking advantage of the silhouette and the textures are wrapping around the forms very well. One thing to nitpick on though is that you probably should avoid textures that rely more on reflection, like metal and plastic, as it's pointless to try conveying them using only cast shadows and you've indicated the way light affects their surfaces instead.

Construction

The main objective of the Form Intersections exercise is to make the forms seem as if they are on the same scene by taking advantage of shallow and consistent foreshortening, and you've done amazing in that regard. The actual intersections are secondary, but even there you've done incredibly. Some of your forms miss hatching, but that's very much so irrelevant.

Following the overarching theme I've set with the rest of this critique, you can probably guess what I think about your Organic Intersections. Terrific job capturing their water balloon properties, making them stable and making good use of line weight and cast shadows.

This is a wonderful submission overall, and I'd be lying if I said I didn't feel some envy from your work here. You have tons of experience, and it shows. Congratulations!

(P.S.: Took a look at your 250 Boxes submission since it looks like you didn't receive any critiques, and those look outstanding as well. Only thing I'd suggest is experimenting with different orders of finding the planes, if you haven't done so already.)