So I was admittedly concerned by your statement there, especially since the assignment for the cylinder challenge's assignment (for the first section) specifically mentioned that you should experiment a great deal with your foreshortening. That concern went a bit further when I noticed that your first couple of pages of cylinders appeared to include no actual foreshortening at all - that is to say, your side edges remained parallel on the page, with no convergence at all.

I will say right now that fortunately you still did a pretty good job throughout the challenge, and that while you may not have been really confident in what it means to have dramatic foreshortening (which really is just a matter of bringing that vanishing point closer to the object, rather than leaving it far off, making the convergence itself very rapid), you have still incorporated some foreshortening into your cylinders throughout that first section.

That said, we should talk about why eliminating the foreshortening altogether would be incorrect. Basically, what we're doing in that situation is forcing the vanishing point to infinity, in the manner discussed back in Lesson 1. This is not something we actually have control over however - we can only decide how we want the form to be oriented in space, and it is that which dictates where the vanishing points go. A vanishing point will only go to infinity when the set of edges it governs in 3D space run perpendicular to the viewer's angle of sight - basically when that set of edges does not slant towards or away from the viewer through the depth of the scene.

Since the cylinder challenge, like the box challenge, has us drawing forms that are rotated completely arbitrarily, we can pretty much assume that we're never going to be in a situation where one of our cylinders is so perfectly aligned so as to put a vanishing point at infinity. Of course, given that this is what you were doing through the first two pages, would definitely make that a mistake, rather than a conscious choice you were making to align them all in such a specific fashion.

Anyway, continuing on from there you did include at least some convergence/foreshortening to most of your cylinders. I have in the past assigned redos of this section for students who kept all their vanishing points at infinity, so it's safe to say that you dodged that bullet.

In all fairness, you actually do incorporate a lot of much more dramatic foreshortening in the later part of this first section - for example, 137 and 140 on this page are dramatically foreshortened, so I'm unsure as to why you felt unsure of it until much further. Still, I suppose that's the opposite of a problem.

Aside from that, you've handled the rest of this section of the challenge well, though do take a bit more care in drawing the side edges. Looking at cases like 148 on this page, your side edges don't always line up super well, which is probably the result of not investing as much time into the planning/preparation phases of the ghosting method at that point.

Continuing onto your cylinders in boxes, your work here is well done. This exercise is really all about helping develop students' understanding of how to construct boxes which feature two opposite faces which are proportionally square, regardless of how the form is oriented in space. We do this not by memorizing every possible configuration, but rather by continuing to develop your subconscious understanding of space through repetition, and through analysis (by way of the line extensions).

Where the box challenge's line extensions helped to develop a stronger sense of how to achieve more consistent convergences in our lines, here we add three more lines for each ellipse: the minor axis, and the two contact point lines. In checking how far off these are from converging towards the box's own vanishing points, we can see how far off we were from having the ellipse represent a circle in 3D space, and in turn how far off we were from having the plane that encloses it from representing a square.

In applying the line extensions correctly throughout your work here, you've been in a position to properly analyze the results of each page, identify where your approach could be adjusted, and make progress from page to page. You've definitely gotten really good at the cases with the more dramatic foreshortening, although while those with farther vanishing points are no doubt still difficult, that is largely expected. You've still shown a good deal of improvement on that front, and I expect your sense of proportion in this regard, as it has developed thus far, should serve you well into the next lesson.

So! A bit bumpy, but all in all still solid work. I'll go ahead and mark this challenge as complete.