As a whole, you've done a pretty good job. There's definitely things you should continue to work on as you move forwards, but as a whole you've followed the steps of the exercise well, you've included variation in your rates of foreshortening, and you've generally demonstrated a good grasp of the concepts.

What I usually look out for in the first part of the challenge are two things:

  • Alignment to the minor axis. Here you're doing a good job of checking your alignment after the fact, but I definitely think you need to take a bit longer in ghosting through the ellipse you intend to draw before executing it, considering how that ellipse is going to line up, because you still seem to be off pretty consistently. If you find yourself being off by the same amount each time, maybe try adjusting the rotation of the page to compensate - if your brain simply wants to draw ellipses in a particular orientation, making adjustments to external factors (that is, other than what your arm is actually doing) can help rewire the relationship between what your brain wants to produce, and what your arm ends up producing.

  • Understanding of how the shift in degree and shift in scale from one end of a cylinder to the other relate to one another, and how they convey overall foreshortening of the form. It's a bit of a mouthful compared to the last one, but basically you're demonstrating that you understand how the more foreshortening you intend to apply to a form, the more the far end will get smaller (that's the obvious one we generally understand at this point) - and more importantly, the more the degree will shift wider to match. I keep a look out for students who apply these shifts inconsistently (a more significant degree shift and a more minor scale shift). You're showing a good grasp of those relationships, and avoid visual contradictions in your foreshortening.

Moving onto the cylinders in boxes, for the most part you applied the line extensions and ellipses quite effectively. The main point of this exercise is more about the boxes than the cylinders - by using the cylinders as part of the line extension strategy, we're able to not only test our boxes for consistent convergences, but also work towards improving our estimation of their proportions. When the ellipse's line extensions line up to those of the box's own edges, we know the ellipse represents a circle, and therefore the plane enclosing it represents a square.

Long story short, you've done a good job of developing your intuitive ability to draw boxes with a pair of faces which are proportionally square - something that'll become quite useful as we get into lesson 6.

All in all, your work is coming along well - but keep working on those minor axis alignments. I'll go ahead and mark this challenge as complete.