Hello Aki. Congrats on completing L1, here are some thoughts and comments on your submission:

Slight arching is visible on those longer lines. This is normal even when drawing from your shoulder, just remember you can arch in the opposite direction to counter this effect.

Table of Ellipses: As a suggestion I'd encourage you to incorporate circles into this exercise as well as trying your hand at some that are much smaller >1 cm or so. This'll come in handy in later lessons.

Rough perspective: It seems to be a common trend that student's line quality take a hit during this exercise. This has happened to you as well, especially with the box's back corner. Remember to ghost your lines and to perform a smooth and confident stroke. You should also keep in mind that during this course you should never go over a line with the intention of correcting it, ever.

Rotated Boxes: Some of your boxes aren't actually rotating, as they still follow the same vanishing point. See this. The gaps between the boxes should've also been kept narrow and consistent.

Organic perspective: I would encourage you to be a bit more experimental with the foreshortening. Make the small boxes smaller and the big boxes bigger. As long as they grow at a consistent rate it'll feel like they are part of a believable scene. I'd also encourage you not to be afraid of overlapping your boxes. So instead of having your line going from one side of the page to the other you could curve it to show depth. The last section in the first page of the exercise is a good example of you doing that.

Conclusion: Good submission, just keep in mind the points above, especially those on line quality and not going over your lines. They will be useful in the 250 box challenge.

Best of luck moving forward

-Slyx