While my usual schedule involves critiquing tuesdays/thursdays and putting my cut-off at midnight before those days in terms of which submissions I'd be tackling during those sessions, I figured I'd sneak yours in and avoid having you wait a full 5 days to get your feedback. The main reason for sneaking you in is simply that your work is very well done, and won't require much time for me to critique.

Starting with your cylinders around arbitrary minor axes, you've done a fantastic job. Your linework is confident and smooth, your ellipses are evenly shaped, you're experimenting with a wide range of foreshortening and orientation, and you're extremely fastidious and mindful when checking the alignment of your ellipses, catching even the relatively small deviations. It's this attention to detail that will ensure you do not plateau in your growth - you're in that territory of being "good enough" with those mistakes being very minor and unnoticeable to the naked eye, but by being as attentive to those discrepancies as you are, you're going to keep improving on that front as you practice.

I'm also pleased to see that you've demonstrated an intuitive understanding of how the different aspects of foreshortening - the shift in overall scale due to the convergence of the side edges and the shift in degree - work in tandem with one another, as they serve to represent the same information. That is, it tells us how much of the form's length exists within the "unseen" dimension of depth, and how much is there for us to visually measure on the flat page.

Carrying onto the cylinders in boxes, your work here is by and large 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.

Throughout your work you've demonstrated a thorough adherence to the use of the line extensions, and while you do continue to have some issues with a given set of 4 edges converging in pairs (especially when the box/cylinder is very long, dividing that set into two on either side of the distance) I can see this improving over the course of the homework as well.

All in all, you're doing great, and you are hitting all the notes that will ensure you continue to hone these skills with further practice of this exercise in your warmups. So, I'll happily mark this challenge as complete.