Starting with your cylinders around arbitrary minor axes, unfortunately it does seem that there are a number of points you may be missing here.

• Most notably, you've neglected to include any variation to your rates of foreshortening, which was specifically requested as part of the assignment.

• Secondly, while the above is an unfortunate lapse in terms of identifying and following the instructions, eliminating any and all convergence to the side edges of your cylinders and instead forcing those vanishing points "to infinity" is actually incorrect. I will explain this in further detail in a moment.

• Your linework - specifically the fact that you have a tendency to go back over your marks repeatedly - suggests that you're not holding to the principles of markmaking from Lesson 1, and that you may not be applying the ghosting method as consistently or as completely as you should be, as it is required for every freehand mark we make throughout the course.

• In the same vein as the previous point, you appear not to be drawing through your ellipses two full times, as discussed in Lesson 1. While I do think you're at least some of the time intending to draw through your ellipses, it seems like you leave that more to auto-pilot. As such, at most you're going around the ellipses one and a half times in many cases.

Now, I expect that the reason this occurred is perhaps that you worked on the challenge over a long span of time. You had your Lesson 5 work marked as complete at the beginning of December, so about two and a half months have passed. That's not a problem at all - students are welcome to pace themselves as needed, and there can often be things that get in the way or that we must work around. On top of that, the work in this challenge is considerable.

That does however mean that it is the student's responsibility to account for that - to ensure that you're doing whatever it is you need to in order to keep the information you require fresh in your mind. Whether it's reviewing the instructions of the task you're doing now to ensure you're doing it correctly, reviewing previous sections and content to ensure you haven't forgotten anything important, or taking notes on those things so you have them ready as reminders when doing your work (to perhaps reduce the need to review the lesson material itself, although nothing will really eliminate that need altogether).

What I'm seeing in your work here so far, is that you have every capacity to do the work correctly, but that you simply went down the wrong path, focusing perhaps more on getting the work done rather than ensuring that you were following those instructions as intended.

Now, I did promise I would explain why forcing your vanishing points to infinity and eliminating the convergence of those side edges was incorrect. In effect, we do not control where our vanishing points fall. What we control is how we intend for the form we're drawing to be oriented in space. It's this orientation, and the orientation of each individual set of edges present in the form, which dictates where each set's vanishing point will fall. The only circumstances in which a vanishing point "goes to infinity" is when the set of edges it governs runs perpendicularly to the viewer's angle of sight.

To put that a bit more simply, it's when the edges in question run straight across our field of view, not slanting towards or away from the viewer through the depth of the scene. Given that we're rotating our cylinders randomly throughout this challenge, just as we did in the box challenge, we can pretty much assume that we'll never achieve such a perfect alignment once in 150 instances, let alone for each and every one. Thus, it's best to include some convergence, even if it's only slight, in the case of shallow foreshortening. But of course, the instructions asked you to include lots of variation in this regard too, so there should be cases of more dramatic foreshortening and rapid convergence as well.

Moving onto your cylinders in boxes, I was admittedly hoping that the issue of forcing vanishing points to infinity wouldn't carry over to this section, but it appears that it did. By and large it appears that when constructing these boxes, you specifically attempted to have your lines run parallel on the page. There are certainly instances of convergence, but it seems that this may have simply been the result of aiming to keep them parallel, and ending up with your angles being a bit off from that goal. This very much undermines the goal of this part of the challenge, which comes down primarily to using the line extensions to test whether or not the proportions of the box itself (or at least the faces containing the ellipses) are proportionally square in 3D space. We do this by comparing the convergence of the ellipses' line extensions to those on each axis of the box, but without any concrete, non-infinite vanishing point being implied by the convergences of the box's edges, there's really not much to be gained there.

I will mention that while this is referenced much earlier in the course (in the box challenge to be specific), students are specifically advised not to draw their freely rotated boxes with edges that are parallel on the page in these "important reminders".

While I understand this is very unpleasant news, given that you just spent the last two and a half months on this challenge, I am going to need you to take another swing at the challenge in its entirety. There's simply too many individual issues that by and large arose from neglecting things that were either mentioned within the challenge's instructions, or otherwise called out previously in the course. When you're ready to submit your next attempt at the challenge, you will need to submit it as a fresh submission, which will cost you one additional credit.

I will mention one last thing - you've taken a wrong turn here, and some of the choices made were unfortunately not to your benefit. This is a thing that has happened, but it does not speak to who you are as a student, or who you are as an artist. It is simply one wrong turn. It's doubtlessly frustrating now, but it will be a forgotten memory before long.

These things do happen, and you are far from the first. In fact, I distinctly remember a few cases where specifically in this challenge, students wildly missed the mark and failed to follow the instructions, but ultimately came back at it having learned from the blunder, only to do an amazing job with everything thereafter. One such example that comes to mind is Grain00, who was similarly asked to redo the cylinder challenge in full, and ultimately went on to demonstrate such patience and care in their work going forward, especially in their Lesson 6 work, that simply was not present in their initial attempt at the cylinder challenge.

I can see in your work that you absolutely have the capacity to match that. It's just a matter of ensuring that the time you spend is invested with care, and that you ultimately hold to the individual responsibilities all students of this course have, as explained here in Lesson 0.

I wish you the best of luck, and I look forward to seeing your next swing at this challenge.