Jumping right in with your cylinders around arbitrary minor axes, as a whole you've done quite well. Earlier on in the set I did notice a few cases (numbers 1,2, 6, 9, 14, 28, 32, 44, 46) where you appeared to be more intentionally drawing cylinders with no convergence to their side edges (and as a result no scale shift aspect of foreshortening from one ellipse to the other), but this appears to vanish in your last 100 of this section. I'm going to assume that you noticed this happening and corrected it yourself consciously - but just in case it was more of a subconscious shift, do be sure to review these notes from the material which explain why keeping those side edges parallel for this exercise would not be correct.
Aside from that however, your work is very well done, and I'm pleased to see that you were extremely fastidious in checking the alignment of your minor axes, and that you were, aside from the handful of overly parallel cases, quite mindful of varying your rates of foreshortening and applying that foreshortening correctly.
Continuing onto the cylinders in boxes, your work here is by and large done quite well. 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.
I can see that for the most part (ignoring number 49 where you seem to have only extended the boxes' lines for some reason), you have by and large done a good job of consistently extending your lines well, and ensuring that your minor axes were extended independently of one another. I'm also pleased to see that you've taken care to have all your ellipses touch all four edges of their enclosing plane, to ensure that the ellipse's line extensions "describe" the proportions of the plane, ensuring that the line extensions are useful for our purpose here.
As a whole your judgment of those proportions has improved noticeably over the set, and while there's always room for continued improvement, you're very much on the right track and should be well equipped for the demands of the next lesson. I'll go ahead and mark this one as complete.
Next Steps:
Feel free to move onto Lesson 6.
This is a remarkable little pen. Technically speaking, any brush pen of reasonable quality will do, but I'm especially fond of this one. It's incredibly difficult to draw with (especially at first) due to how much your stroke varies based on how much pressure you apply, and how you use it - but at the same time despite this frustration, it's also incredibly fun.
Moreover, due to the challenge of its use, it teaches you a lot about the nuances of one's stroke. These are the kinds of skills that one can carry over to standard felt tip pens, as well as to digital media. Really great for doodling and just enjoying yourself.
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