Starting with your cylinders around arbitrary axes, there are a number of issues here that suggest to me you may not be taking as much care in thinking through each step and decision you make when constructing your cylinders. I say this because the issues are inconsistent - it's one thing to have the same mistake present throughout all your work (which suggests a misunderstanding), but when we see different issues coming up periodically throughout, with some cases where they're done more correctly, it tells me that the way in which you're approaching the work is different each time. That only really happens when the student isn't following the instructions carefully, but rather working from memory and hoping that they'll get things right.

Here are the kinds of issues I'm seeing:

• Not drawing through your ellipses two full times - you sometimes stop at 1 turn of the ellipse, or 1.5 turns, but there are many cases where you are not ensuring that you draw around the shape two full times as required back in Lesson 1.

• Your execution of your ellipses is frequently hesitant, resulting in uneven ellipses. You should be using the ghosting method when drawing all of your freehanded marks, including the ellipses, which focuses on investing your time in the planning and preparation phases, and ultimately executing the marks with confidence, and without hesitation. This helps us maintain smooth, even shapes. When our shapes come out unevenly and show a lot of wobbling, it specifically means that we are hesitating in our execution and not drawing confidently. I strongly recommend that you review the ghosted lines instructions from Lesson 1.

• I'm also not seeing any signs that you're using the ghosting method for your side edges.

• I'm not really seeing signs that you understand how the "degree shift" works. The ellipse on the farther end is meant to be proportionally wider than the end closer to the viewer, while also being smaller in its overall scale. I'm frequently seeing you either maintain the same degree for both ends, or have the far end be the narrower one. This is something that is also covered a fair bit in the Lesson 1 ellipses section, including in the video at the top of that page.

• There are also numerous pages, like the ones with cylinders 91-96, where you seem to force your vanishing points to infinity. This is specifically explained as a mistake in these notes.

As a whole, this part of the challenge was not done correctly. As explained in Lesson 0, it is the student's responsibility to ensure that the work they submit is done to the best of their current ability, taking care to apply the concepts introduced in the previous lessons, and taking as much time as is required to do that. You have not done that here.

Fortunately, the other portion of the challenge - the boxes in cylinders, which are generally much more time consuming - are considerably better overall. 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.

In applying your line extensions correctly, you've been able to give yourself plenty of information to assess, so you could adjust your approach for the next page and keep working to get those line extensions to align more consistently.

So- I am going to need you to redo the 150 cylinders around arbitrary minor axes, but fortunately because your second section was done well, I won't be assigning a full redo. Just be sure to take much more care in following the instructions. Additionally, keep in mind that you're meant to be practicing the exercises you've been introduced to throughout the course as part of a regular warmup routine, so you continue sharpening those skills, and aren't prone to forgetting to apply them to your work. If you haven't been doing so, that is unfortunate, but be sure to start doing so now. I'd also advise you to review all of Lesson 0, to ensure you haven't forgotten anything else in regards to how this course is meant to be used, and what your responsibilities are.