Hello, I'll be handling your box challenge critique.

Starting off with your line work you're looking more confident and tidy than at the start which is great, by no means were your lines poor quality to begin with but theres definitely some improvement in terms of quality and consistency.

You drew large which is ideal because it lets us become more comfortable using our shoulder and allows us to see any mistakes we made more clearly.

When it comes to your boxes themselves there's a few things to mention. It's good to see you experimented with different orientations but you didn't experiment as much with proportions. In the future try drawing some boxes thin/wide and short/long to see how they'd react to different rates of foreshortening as well as to grow more comfortable converging lines of different lengths.

As for your convergences themselves they've grown more consistent but it feels a bit like you tried experimenting in pages 11-20 and then were worried you were making a mistake so you kept the rest of your boxes pretty similar. Definitely experiment with different rates of foreshortening by moving your vanishing point closer or further away. You mentioned that foreshortening only one VP leads to some distortion and that is definitely the case, you can use this fact consciously in some scenarios but you can also keep each vanishing point a similar distance which then helps your form appear more consistent.

Take a look at this image, it shows how each line in a set relates to a vanishing point. A common error people tend to make is that if the vanishing point is further away they try to keep their lines as parallel as possible and if the VP is closer they'll converge their lines in pairs, both of these methos are mistakes however. While our boxes may have parallel edges perspective will always play a role (unless it's aligned perfectly in a way that one side is facing us) so our lines should converge to a vanishing point. Converging in pairs is also a mistake and leads to distortion, you'll notice that the inner pair of lines will remain fairly similar while the outer pair in a set will vary quite drastically depending on how close the vanishing point is.

Basically our lines should never diverge, and should always converge as a set to some extent towards a single vanishing point

It does appear like you may have a feeling for this idea intuitively but there are times where it appears like you're trying to keep your lines super parallel or your lines converge in pairs, so it's worth addressing as some people find an example helps deepen their understanding.

With all of that said however this was a solid submission, you do have room to experiment and grow more but you are producing more consistent and improved work. I have no doubt you'll improve with more experimentation and mileage so I'll be moving you on to lesson 2.

Keep practicing previous exercises as warm ups and good luck!