2:52 PM, Monday May 24th 2021
To start, I feel like I should explain that anyone who only takes a few days on the box challenge is not likely investing as much time as they need to in each box. As for the whole aphantasia thing, in my experience (having aphantasia myself), those who are able to visualize things in their mind's eye end up having to deal with something of a distraction, rather than an advantage. This exercise is very much not one of drawing from observation - it's about developing your spatial reasoning skills through the repeated solving of a spatial puzzle. As one moves through this course, those who can visualize things in their head ultimately learn to "close" that mind's eye, to rely on a more abstract, generalized understanding of how forms exist in 3D space, and how they relate to one another.
Looking through your set here, to start your linework is generally pretty good. It gets a little shaky here and there, and I can see places where you've attempted to correct mistakes by drawing marks repeatedly (like in 193 and 194 - as a rule, you should simply leave your mistakes alone, rather than trying to correct them as this draws more attention to a blunder which is otherwise an entirely natural part of doing exercises), but for the most part you are drawing with a good deal of confidence and your lines come out straight and smooth for it.
There are however two key problems. The biggest of these comes down to the fact that you seem to be trying to draw your boxes with no actual foreshortening across the vast majority of these. There are a lot of boxes here that, like 231, 221, 236, 191, etc. specifically attempt to avoid any convergences at all. That is fundamentally incorrect.
Back in Lesson 1, we talk about how any set of lines which are parallel to one another in 3D space will generally converge to a shared vanishing point when drawn in 2D (like on a piece of paper, which is flat). The rate of that convergence, and the proximity of that shared vanishing point, depends on a lot of factors, but there's still going to be convergence - whether it is rapid and dramatic, or gradual and shallow.
In Lesson 1, we discuss just one scenario where the vanishing point "goes to infinity", resulting in those lines being parallel on the page, with no actual convergence. This occurs when the set of lines in question runs perpendicular to the angle of sight from which the viewer is seeing them. This is a very specific orientation - for example, if a viewer is standing straight, looking out across a flat ground plane (their angle of sight running parallel to that ground plane), then any box sitting flat on that ground plane will have its horizontal and vertical lines running perpendicular to the angle of sight.
Given that this challenge has us drawing boxes at entirely random angles, we can pretty much assume that we won't end up in the perfect orientation for any of a given box's lines to run perpendicular to the angle of sight. Even if we did, it would only apply to one or two of the sets of lines - never all three. There is no 0 point perspective. There is axonometric/isometric projection, which is what you end up using, but it is actually a fundamentally different set of rules used to represent 3D space on a 2D surface. While it's valid, it serves a different purpose, and unlike "perspective projection" which we're using here, does not strive to capture the world as humans see it.
So, long story short - you need to be thinking about how your lines converge, be it gradually or rapidly, and eliminating that convervence is not an option.
Considering this convergence, and how you orient a given line to more consistently converge with the other lines in its set, is really at the heart of this exercise. As you go to draw a new line, you look at both the lines with whom it should share a vanishing point - both those that already have been drawn, and those that have yet to be drawn, and you consider how your new line needs to be oriented to have them all converge consistently. Thinking about how they all converge at a far-off point, and considering the relative angles between them as explained here will also help you think about when you should be angling a line more sharply, or when it can run more close to parallel to another.
Now, the other issue I noticed does largely relate to this - it's an issue that didn't come up all over, but specifically in this page I can see you filling the faces on the opposite side of the boxes with hatching, and extending some of your lines (like the red lines on box 200) in the wrong direction. It's critical that you remain aware of which side of the box is facing towards the viewer, and which side is facing away.
While the first issue I pointed out is a pretty significant one that will have to be addressed before you can move on, I'm actually pretty confident in the fact that once it's sorted out (and it was definitely a case of you taking the wrong turn, thinking you could simplify certain aspects of these constructions in ways that you really couldn't), you'll be handling these box constructions fairly well. So, I'm going to assign a fairly minimal set of revisions for you to demonstrate your understanding below.
Next Steps:
Please submit 15 additional boxes. Take care to vary their rates of foreshortening more, working with both shallow and dramatic foreshortening, but do not in any situation eliminate foreshortening altogether.