Starting with the cylinders around an arbitrary minor axis, you've generally done a good job here. Be sure to go through your ellipses two full times before lifting your pen and you'll be good to go on that front. You've experimented with the rate of foreshortening (something that a lot of people seem to neglect, despite it being in bold in the instructions). You're also checking for minor axis discrepancies quite fastidiously so good job on that.

One thing I want to mention about your cylinders has to do with the two ways in which the ellipses on our cylinders change over the course of its length. The first has to do with the "scale" shift, in which the farther end of the cylinder appears smaller than the closer end, even when both ends are actually the same size. The other thing has to do with the "degree" shift in which the farther end appears to be proportionally wider. The thing is, both of these shifts are manifestations of foreshortening. These are the signs our brain uses to understand how much of this form exists on the unseen dimension of depth. As a result, both of these shifts must operate in tandem. As the scale shift becomes more significant, it has to be matched with a similar shift in degree. If we look at cases like this, we get a noticeable shift in scale while the degree remains the same. The viewer will be able to tell something is off even if they don't know the exact reason for it, so keep this in mind moving forward.

Moving onto your cylinders in boxes, these are also looking good overall. What we're trying to do here is develop our understanding on how we construct our boxes to have proportionately square faces regardless of the box orientation. To do this, we don't actively memorize every single configuration but instead we subconsciously develop that understanding through repetition and analysis.

The box challenge was all about developing a stronger sense of how to achieve more consistent convergences by analyzing the line extensions. Here, we're just adding three more sets of line extensions: the minor axis lines (which also happen to be one of the vanishing points), and the two contact points. We can check how far off these are from the box's vanishing points and this helps us determine whether the ellipse represents a circle in 3d space, and in turn how far off the plane was from representing a square.

Overall, I think you clearly understand the point of this exercise so I'll be marking this as complete. Hopefully, the explanations help push your understanding even further. Feel free to move onto lesson 6.