Starting with your cylinders around arbitrary minor axes, overall these are coming along well. Your linework is excellent, and you've been quite fastidious in checking the alignment of your ellipses. One thing I did notice was that for the most part you tended to stick to cylinders with fairly shallow foreshortening, and didn't do a ton of experimenting with more dramatic foreshortening, so that is probably something you'll want to do more of in your warmup exercises.

Additionally, keep in mind that as our cylinders are foreshortened, it manifests in two main ways - the shift in scale from one ellipse to the other, and the shift in degree. Because these both work to signify the same thing, it does mean that they work in tandem - so as the scale shift increases, and those side edges of the cylinder pinch together to achieve a more dramatic convergence, so too would the far end get more notably wider, as its degree shift matches the shift in scale. If you take a look at cylinder 130, you might notice that something about it feels ever so slightly off - it's because the far end isn't quite wide enough to match.

Continuing onto your cylinders in boxes, unfortunately it appears you may not have taken as much care as you should have when going through the instructions, and as a result, you skipped over a pretty significant part of the exercise. As explained here, and in the video at the top of the cylinder challenge page, the line extensions for this exercise involve extending the 6 lines in each direction. For each direction, 4 come from the box itself, and then 1 comes from each ellipse. You seem to have only extended the boxes' edges, as well as the cylinder's side edges, and did not include any of the ellipse-specific lines.

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 - which is why they're so important.

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.

Unfortunately since you did not follow those critical instructions correctly, this part of the challenge will have to be redone in its entirety.