Congratulations on completing the 250 Box Challenge! I'll answer your questions really quick before moving onto your critique.

1. Students largely should be waiting to have their previous lesson/challenge marked as complete before moving onto the next lesson. Don't assume you're going to have it marked as complete as a matter of course. You don't need to restart Lesson 2, but in the future please don't jump ahead.

2. Some people do both in one day, others will alternate days. What matters is that you're not spending long lengths of time (ie: several days) just doing exercises, that there's a healthy mix, though they don't all have to be in the same day.

I hope that answers your questions. Now for your critique!

You did really well on this challenge and when I compare your first few pages of boxes to the last sets I can see a huge improvement. Your lines become smoother and more confident looking. You do a better job of adding additional weight to your lines so that it blends more seamlessly with the previous mark. Your sets of parallel lines also do a better job of converging more consistently towards their shared vanishing points. Great improvement overall!

One thing I want to point out is your hatching. While the rest of your lines are very clean, straight and confident looking, the hatching you add to your boxes doesn't quite match this quality. It is important to keep in mind that while you are doing Drawabox you are meant to employ the ghosting method for every mark you make. No matter how small and including the hatching marks. That means taking your time to plan and ghost out your marks before executing them from the shoulder. Just keep that in mind for the future as you do a very good job in every other part of your construction.

Finally while your convergences do improve overall I think this diagram will help you further develop that skill as you continue through Drawabox. So, when you are looking at your sets of lines you want to be focusing only on the lines that share a vanishing point. This does not include lines that share a corner or a plane, only lines that converge towards the same vanishing point. Now when you think of those lines, including those that have not been drawn, you can think about the angles from which they leave the vanishing point. Usually the middle lines have a small angle between them, and this angle will become negligible by the time they reach the box. This can serve as a useful hint.

Great job again and good luck with lesson 2!