Hi Éric, and welcome to drawabox! So, first things first, in the rotated boxes exercise, you’re not expected to think about the vanishing points too much. There’s an explicit mention of them in the text, but this is mostly so that students are aware of the fact that they’re moving, and can as a result avoid this common mistake. During the construction of the boxes themselves, however, you’re not thinking about the vanishing points, so much as you’re thinking about the neighboring edges. Even as you complete the box challenge (which from your message I’m understanding you did, or are about to) you’re not expected to be able to rotate a box in your head, and draw it at any angle, though hopefully by that point you’re able to draw a correct box, at any angle it may be in. All this is to say, though you’re welcome to look all of this up (quite simply, by taking Uncomfortable’s boxes, and extending their lines towards their vanishing points in Paint, or what have you), this is not something you should get too caught up on. For now, we’re just trying to give you an intuition for how this works. I hope that answers your question. Let’s see about your exercises, now.

The superimposed lines exercise looks solid. Your lines are smooth, properly lined up at the start, and of a consistent trajectory. There’s a little bit of hesitation in your arcing lines, but this is perfectly normal. For now, I’ll just quickly remind you that it’s more important for them to be smooth, than it is for them to stick to the guideline. The ghosted lines/planes look quite confident, also, though I notice some adjustment near their ends. Here, too, it’s more important for the resulting line to be smooth, and straight, than it is for it to be accurate. Rather than decrease your spend in the second half, in an effort to not stop short of, or overshoot the end point, maintain a consistent speed throughout.

The table of ellipses exercise looks mostly good, though I do wish you’d made better use of your page. Also, some of your ellipses are a little stiff, so I’ll again remind you of our priorities: confidence first and foremost, then accuracy. Finally, be sure to draw through them a minimum of 2 times, and no more than 3. This extends to your ellipses in planes, too, though these are quite a bit more confident, so it seems like you picked up on that error yourself- nicely done. The funnels, as I’m sure you’ve noticed, start to float inside of their frames near the edges, but they’re fairly well done, outside of that. Your ellipses are confident, snug, and properly cut in half by their respective axes.

The plotted perspective exercise looks clean- nicely done.

The rough perspective exercise is, as you’ve mentioned, a little lacking, but it improves nicely in its second page (I’m assuming the pages are out of order.) One thing that I’ll caution you against is the automatic reinforcing habit. You’ll remember from the notes in the ghosted lines section that each line is drawn once, and only once, regardless of how it turns out. If you absolutely need to correct a mistake, do so with a differently colored pen.

The rotated boxes exercise looks solid. I notice that the 4 boxes at the edge of it are not drawn through, however. Could it be that you drew these last? If so, that’s probably why the rotation is so minimal, here. Other than that, the boxes look fine. The outer layer isn’t as snug as we’d like it to be, and, of course, there’s issues regarding the convergences of your boxes, their far planes in particular, but this is more than expected. I will mention, however, that the hatching needs to be done using your shoulder, too.

Finally, the organic perspective exercise looks nice, save for some light errors. Firstly, a box that’s overlapping another shouldn’t cover its lines- always draw through your boxes. Second, be mindful of their foreshortening, in this exercise, in particular. For a similar reason, be mindful of the automatic reinforcing habit, too. You don’t want boxes that shouldn’t pop up in front to do just that. That said, your boxes still flow nicely, as a result of a consistent increase in size, so not to worry.