Starting with your cylinders around your arbitrary minor axes, your work is a bit mixed, although there is progress over the set. Earlier on, you run into issues like keeping the side edges of your cylinders parallel on the page, which is specifically addressed as something to avoid in these reminders from the lesson material. I can also see issues in how you're approaching your markmaking - you don't appear to be holding to all of the principles of the ghosting method as closely as you should be, which is causing the actual execution of your marks to be a little more hesitant.

It's not always super perceptible, but there is a slight wavering that I've become quite attune to picking out, and it tells me that when your pen touches the page, you hesitate a little as you execute. This usually happens because the student is worried about making a mistake and being less accurate - but as noted in Lesson 1's principles of markmaking, the confident execution is our top priority. The ghosting method helps with that, by allowing us to focus our time into the planning and preparation phases. We still of course have to execute with confidence, but it gives us some more room to improve our chances of being accurate.

The problem does sometimes arise however that when students push further into the course, they aren't always making sure that they're applying those principles from earlier in the course - they may intend to use the ghosting method, but they may out of impatience put less time into the planning and preparation phases, which then results in them feeling less willing to be confident in their execution - and so they hesitate. So, be sure to be mindful of this going forward.

Additionally, I similarly noticed that you don't appear to be consistently drawing through your ellipses two full times, which appears to be another point from Lesson 1 that you've allowed yourself to slip on. I suspect that, like with the ghosting method, your intent is to follow the approach, but as with all things, when we allow our focus to shift to other things, we perform individual actions and tasks that feel familiar to us with less care - and so instead of going around the full two turns, you might stop at one, or one and a half. Of course, the ghosting method should also be employed with our ellipses, as with all our freehanded markmaking throughout our work for this course.

As you progress through the set, I see fewer and fewer cases where you're trying to keep those side edges parallel, which is certainly a good thing. I can also see that you're checking your minor axis alignment quite fastidiously, so you're headed in the right direction. You simply need to be more mindful of the points raised from earlier course material, and also of those specific points (like the reminders I linked earlier) that are called out for you to keep in mind here.

Continuing onto your cylinders in boxes, these are coming along decently well. 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.

While the linework concerns are still present, you held well to these aspects of the exercise, so you were well equipped to analyze your results and improve over the course of the set. One thing I noticed that you seemed to be improving upon consciously and intentionally was the tendency to have your sets of edges converging in pairs (instead of all 4 of a set together) - you seem to have made a concerted effort to bring them back together, and to be more mindful of them, especially as your boxes/cylinders get longer.

As a whole, you're heading in the right direction - you've got issues to address, but these are things you can tackle in your regular warmups, which this exercise will now become a part of. I'll go ahead and mark this challenge as complete.