hi there 123_456, i'll be the one looking over your submission, but before getting started i'd like to congratulate you for finishing the 250-box challenge, not everyone is able to complete it as it's a challenging task that takes a lot of time, so you being able to stick by it and reaching the 250th box means that you're eager to improve and you have the patience on what it takes to tackle the next lessons.

• so starting off, i noticed while skimming through your submission that there's one case where you didn't extend a box or cross it out, keep in mind that making mistakes is a part of growth there's no point in hiding it since it'll hinder your growth if not found out while correcting it will just make matters worse. in future lessons/exercises on this course, when you make a mistake, it's best that you work with it.

• next up is your extension lines, most of the time you've extended them in the right direction as well as extending them just right to get an overview on how off or close you are onto coverging your set of lines, there are some small hiccups here and there so one tip that you can use for correctly extending your extension lines is by drawing small little arrows after you finished drawing your initial y like in this image here, you can also notice that the angle of the initial y should be greater than 90 degrees since having a initial y lesser that that would make it look deformed, make it look like it's on 2 point perspective and would be hard to know which is the right direction for you to correctly extend your lines.

• next up is the lineweight, it's good that you only applied it in the silhouette of the box. one thing that caught my eye is that sometimes the lineweight is uneven in some parts, one thing you can do is to stick by with only 1-2 additional lines when adding lineweight.

• hatching, like any other line, deserves to be applied using the ghosting method too. remember that hatching lines should be space evenly and consistent, it shouldn't be rushed or done sloppily.

• you've done a great job with experimenting different sizes, orientations and rotations of boxes it's also great that you kept your pages with a maximum of 5 boxes per page.

• convergence, divergence, parallel - this shown right here is convergence by pairs which is something that i've seen in some of your boxes and is a common mistake made by other students, although there's no definite solution as it still does take a lot of mileage before lessening the convergence by pairs issue, it would help to change your perspective a bit, This image here shows how each line is actually related to one another, when you move the vanishing point further, your lines will be close to parallel but not completely parallel(it wouldn't be completely parallel because it'll become isometric perspective, and isometric perspective is not real in real life.), when you move your vanishing point closer, the rate of foreshortening also would be dramatic, but you can never make it diverge or split onto multiple points.

overall this is a pretty solid submission, although there is still some things to be improved, there's no doubt that you've improved throughout the challenge. don't forget to put this challenge in your pool of warmups as well as the points that i've raised, with that being said i'll be marking this submission as complete.