Jumping right in with the cylinders around arbitrary minor axes, your work here is very well done. You've done a great job of executing each line and ellipse with care and confidence, you've varied your rates of foreshortening and orientations throughout the whole set, covering a wide range and giving you plenty of experience with many different rotations of the form, and you've been extremely fastidious in checking the alignment of your minor axes, capturing both deviations that are more obvious, as well as those that could easily be missed, resulting in one's growth with this exercise plateauing.

I also noticed that - whether consciously or subconsciously - you picked up on how the scale shift and the degree shift of the ellipses work in tandem to convey to the viewer how much foreshortening is being applied to the form (and therefore how much of its length is measurable right there on the page). It's easy to end up in situations where, if the shift is chosen at random, you can end up with situations that feel off (like where you might have a very dramatic scale shift with steep convergence to the side edges, matched with virtually no shift in the degree to match), but I'm not seeing anything like that in your work.

Continuing onto the cylinders in boxes, your work here is similarly 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.

You've done a great job of applying the line extensions as instructed, and so you've been armed with plenty of information by which to adjust your proportions from page to page. While there's always more room for continued growth, I think you've developed those instincts quite nicely throughout your work here, and should be well prepared for what comes next in Lesson 6.