Congratulations on finishing the box challenge! Overall you're doing a pretty good job, specially line confidence is really good; I can see you're not afraid of making mistakes which is great! But here are a few things to keep in mind so you can keep improving:

-Sometimes some sets of lines in your boxes are parallel or even start to diverge a little, this is something that should never happen in 3 point perspective; lines will always converge and get closer, even if it's just a little.

-Second is that you tend to extend your lines too short, and because of that's they are sometimes not enough to tell you where your mistakes are. So when extending your lines do it all the way through, don't be afraid of lines colliding with other boxes.

-I've also seen you having variation on the boxes you drew, which is great! But I think that sometimes you fall into a few patters, so take a look at this picture so it gives you more ideas about what orientations of boxes you can try.

-Other thing is the lineweight, as I mentioned is pretty confident and great, but there are a few instances where your superimposed lines get a bit wobbly, so I want to remind you that the boxes you draw in which you draw a superimposed line and the result is confident is what you want to keep doing, regardless of how accurate that superimposed line is the important thing is to trust your muscle memory and make a confident line regardless of accuracy, just like you've been doing on most of this.

-And last thing I wanted to talk about is the inner corner. It looks like it's still giving you trouble by the end of the challenge, and that's completely normal, most students still do. But here are a few things that made tackling it a bit easier to me. First one is trying this order for drawing boxes.

And second is related to it, and it's that thinking about the relationships of each line on a set instead of thinking on pairs will make you make better guesses. It's explained on this picture.

Overall like I said pretty good job! Once you get more comfortable with the inner corner I recommend looking into the adittional exercises. Good luck on lesson 2 and keep up the good work!