Starting with your cylinders around arbitrary minor axes, the cylinders themselves are good - you're demonstrating a good sense of the degree shift from one end to the other, and are quite fastidious in checking your minor axis alignments, catching the kind of small discrepancies that'll keep you from plateauing as you get into that "close enough" territory. That said, I do believe that you are slipping off the rails in terms of some of the core principles of markmaking - not badly yet, but you're allowing yourself to redraw marks reflexively (both correcting mistakes, which students should not be doing at all, and at times to add line weight).

Every single mark we execute must individually employ the ghosting method to ensure appropriate planning/preparation preceding a confident execution - while many students will skimp on the first two steps and end up executing with more hesitation where they try to do all of the planning/preparation as they execute the mark, here you do appear to be maintaining that confident execution (which is great), but need to keep a bit more control of which marks you allow yourself to draw to avoid the stray marks that come from correcting mistakes.

Always remember - Drawabox is tedious and time consuming for a reason. While the goal is to be able to have you focus your cognitive resources on what it is you wish to draw, rather than the how, we achieve that by having students approach every decision they make as intentionally as possible throughout this course. That's how we hone and rewire the instincts that you'll be relying upon later, so that they can yield stronger overall results. So, be sure not to skimp on the time you're giving yourself to complete the work - it's normal to feel the urge to get through the work quickly, and putting less emphasis on the planning/preparation phases can definitely free up a lot of time (given how we need to be doing that for every mark it really adds up), but it's not worth what you ultimately miss out on.

Continuing onto your cylinders in boxes, I did notice some issues on occasion, in terms of how consistently you were holding to the line extension instructions. Most of these issues are relegated towards the beginning of the set, suggesting that you caught your issues and learned from them. The issues are as follows:

• Here you appear to be pretty inconsistent with how much of the line extensions you're willing to actually draw, usually focusing on a single axis instead of all three. This definitely would have been a bad thing to have continue on and would have warranted a full redo, but fortunately you rectified the issue fairly quickly.

• To the right of the same image, we can see a couple spots where you've extended your lines incorrectly, bringing them closer to the viewer rather than extending them as they move away. Specifically this one and this one. This issue was pretty uncommon in your work to begin with, even at the beginning, but it did occur for the first third or so of your cylinders in boxes. If you're worried that this is something you might not completely have under control, check the notes relating to the line extensions on the 250 box challenge page.

• Looks like you entirely skipped the line extensions for your ellipses on the right side of this image.

Ultimately, those line extensions matter a lot. 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.

Now, through the second half of this exercise you generally did pretty well, although there's one last thing I want to draw to your attention: all the lines we're extending need to be extended like those of the box. Right now it seems like you're only drawing the minor axis lines in the manner we did for the previous exercise (where the goal was to simply identify them). That is not sufficient for this challenge, as leaving them short can make it very easy to ignore them when analyzing our results, leaving a place for errors to accumulate and hide, making it more difficult for us to improve with further practice.

I will be marking this challenge as complete, but I urge you to take more care in ensuring that you're following the instructions to the letter, and that you are holding to the principles behind the ghosting method with every freehanded mark.