As a quick note, it's pretty normal for imgur albums to be out of order, as a result of their mobile uploader being a bit of a mess. We tolerate it because we still prefer the fact that imgur allows us to view all of the images easily without having to click on individual ones to expand them, allowing us to jump around more easily. Despite them being out of order, it's still generally easier than having to click on each image.

Conversely, we do allow students to host their work on other platforms, but in this case, both the fact that the pages are out of order and I have to click on each one is... very far from ideal, and does make this critique more time consuming. Just something to keep in mind in the future.

Starting with your cylinders around arbitrary minor axes, your work is a bit mixed, primarily as a result of you missing the bolded instruction from the assignment section - to vary the rate of foreshortening across the set of 150 cylinders. You varied it slightly, but mainly between either drawing all of the side edges of your cylinders as being parallel on the page with no convergence between them - something we'll talk about further in a moment - and having them converge a little.

The cases where you had your lines running basically parallel to one another on the page is actually incorrect. The only way those lines would be parallel on the page is if their vanishing point is at "infinity" (in the manner discussed back in Lesson 1), is if the set of edges that vanishing point governs in 3D space actually run perpendicular to the viewer's angle of sight. Another way of thinking about that is, those edges would not be slanting towards or away from the viewer through the depth of the scene. Any other orientation, and we'd have to have a concrete vanishing point.

For this reason, we cannot merely assert where the vanishing point will go, and we cannot force a vanishing point to infinity to simplify the problem we're dealing with. We control how the form itself is oriented, which determines how its individual edges are oriented, and which, finally, controls where the vanishing points go.

And so, the cases where you had slight convergence to your cylinders are largely fine - but those where the side edges are running entirely parallel on the page is incorrect, because it's very clear that your intent for those cylinders is not to have them running across the viewer's field of view. This challenge in general has us drawing our forms such that they're randomly rotated, so it is fair to assume that we'd never in such a small sample size run into a cylinder aligned so perfectly as to have a vanishing point at infinity.

Aside from that, your work is fine - though don't forget to draw through each and every ellipse two full times before lifting your pen. You've got some where you only draw around the shape once, and many others where you draw through them minimally, stopping at about 1.5 turns. Go for a full 2, no more, no less.

As to your cylinders in boxes, your work here is largely 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 your line extensions correctly as you've done here, you've given yourself the information required to, page after page, adjust your approach to bring those convergences closer together. While there is certainly room for improvement with this, to bring those convergences together even closer, that's expected, and entirely normal. What you've established here is that you appear to understand how to approach this exercise, so you can continue to hone these skills going forward.

That said, I do want to stress one thing: the major axis is not something you should be paying attention to. It is very easy to confuse one's self between the major axis and one of the 'contact point lines', but they are not the same thing, and the major axis plays no role in what we're doing here. Focus only on the minor axis and the two lines defined by the points at which the ellipse touches its enclosing plane, as explained in the instructions.

As you'll note here, I mention in the second paragraph that only the minor axis matters.

So, to your first question, you are correct. To your second question, you are incorrect, if I'm understanding you correctly. The line that runs down the "spine" of the cylinder aligns to the minor axis, not the major axis - though your work suggests that you already understand this, so I may simply not be understanding what it is you're asking with that question.

Anyway, I'll go ahead and mark this challenge as complete. You're very close to getting a redo on the first section, but you had enough cylinders converging slightly that I do not feel it is necessary to do another round of feedback. Just be sure to read the assignment section more closely in the future, so you're certain you're doing what is asked.