Starting with your cylinders around arbitrary minor axes, overall you're doing well. Your linework is fairly confident, although I do see signs that you may not be as consistent in applying all the aspects of the ghosting method as you could be. Your results are still coming along fairly well, in terms of straight lines being straight and avoiding wobbling, but I do want to impress upon you the importance of following all the instructions to the letter while going through this course. The goal always comes down to influencing and rewiring the natural way in which we do things when not thinking consciously about it, so that when we draw our own things we can focus our cognitive resources on what it is we wish to draw, less so how we go about executing each individual mark. In order to achieve that however, we have to be especially intentional here.

Just to be clear, you're mostly doing fine - just make sure you always plot those start/end points where applicable, or otherwise take that moment to consider the specific nature of the mark you wish to make, so you continue to get the most out of the process.

When it comes to the cylinders themselves, you've done a good job of being fastidious with checking your minor axis alignments, catching both significant and minor issues. With the minor issues that can be a significant source of stagnation as one enters the "good enough" territory, so it's good that you're still very mindful of catching those little mistakes.

Continuing onto the cylinders in boxes, all in all your work here is coming along well, in terms of following the instructions. 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.

The one thing I wanted to call out is to make sure that you're always striving to have your ellipses touch all 4 edges of the plane that encloses them. This will ensure that the line extensions we derive from the ellipses are essentially describing the plane's proportions, allowing us to glean useful information. If we approach them as done in cylinder 196 on this page, or on 211, 213, and 214 here, the ellipse doesn't end up telling us anything useful about the proportions of the overall box.

I suspect this is something you were paying attention to earlier on, but that you may have lost track of later, resulting in it coming up more frequently in your work.

So! Keep an eye on that, but I'll go ahead and mark this challenge as complete.