Starting with your cylinders around arbtirary minor axes, I think here you've done a fantastic job of really putting your all into the work. You've clearly focused on hitting all the points in the instructions - including a variety of rates of foreshortening and orientations, and a great deal of care and fastidiousness in identifying your "true" minor axis alignments.

Towards the beginning you definitely had more instances of misalignment, but that improved over the course of the set. There were still some that were more notably off towards the end, but these ended up being with vastly wider degrees, which inherently stand out more - so I'd still say you're definitely improving on that front, it's just that the wider the ellipse, the more exaggerated a slight misalignment will be.

I also noted that you're clearly demonstrating a good grasp of how the shift in degree from one end of an ellipse to the other relates to the shift in scale. I'm not seeing any notable cases where there's a more dramatic shift in one, but a lesser shift in the other, which is a common issue students end up showing here. This shows a strong understanding of the underlying mechanics of perspective, either on a conscious or instinctual level.

Continuing onto your cylinders in boxes, I understand that this is definitely a demanding, exhausting, and potentially demotivating exercise, but you have done a great job here as well. The key point about this exercise is that it's about the boxes, rather than the cylinders. The cylinders themselves are an extension of the error checking we do in the box challenge - where those test our consistency in the lines' convergences, by adding the cylinder and their own lines (the minor axis and contact point lines for each ellipse) we're further able to test the proportions of our boxes.

Specifically, we test to see how far off our boxes are from featuring two opposite faces that are proportionally square. When those ellipses' line extensions converge to the box's own vanishing points, we know that the ellipses represent circles in 3D space, and therefore the planes enclosing them represent squares. Of course, that perfection is rare - but what matters most is that we analyze and test, and then make adjustments to bring them more in line for the next page. This is exactly what I see you doing, and I can see a steady improvement with your proportions over the course of the set.

This suggests the development of those instincts on a subconscious level - something that will be very valuable as you move onto the next lesson. So, I'll go ahead and mark this one as complete. Keep up the great work.