Hello Endxnova, I will be providing you a critique! I'll be using Elodin's guide as well as adding my own observations!

Line Extensions: Starting off, all of your line extensions are great! However you've seemed to forget some sets on Boxes 18, 32, 69, and 80 -- Overall good job!

Divergence/Parallel Line and Inner Corner: For your line convergences, on earlier pages the inner corner seems to be the one that diverges the most. For example: Box 12 on page 1, you can see the inner corner on all 3 sides are either diverging or parallel. Most of your outer lines are good though GG. To help with this issue of the inner corner, you can try out this technique that I saw posted in the Draw-A-Box Discord: https://imgur.com/a/DHlA3Jh. There's also this diagram you can take a look at: https://i.imgur.com/8PqQLE0.png, it's a bit hard to understand but it covers how you should look at the angles between the lines in each set, instead of in pairs. As I looked at your later pages the inner corner starts to get better at converging, your page 18 with Boxes 108 - 112 is where I noticed major improvement!

Line Hatching: As for your line hatching... there is an issue with some of them where the start of your line isn't placed carefully (Ex: Box 243, page 44). You should place your pen carefully at the start of each line, at least to where it only frays on one end, not both. Otherwise it'll look rushed and incomplete -- Remember to take your time on ghosting them too.

Line Weight: Some boxes have more weight on certain lines of the boxes. I notice this with Boxes 134(page23) and 166(page 29). Then again, I could be confusing that for your line extension marks? Apologies if that's the case. If it isn't however, then this is just a reminder to make sure you're adding weight subtly to the outer lines of the boxes for silhouette.

Wobbly Lines and Repeating Lines: There is your occasional repeating/wobbly line(ex: Box 126 inner corner, page 21) but all of your lines are confident and well executed! Well done!

Similar Orientations with Boxes: You seem to recognize and understand the error at page 28. There isn't much to say other than good job!

Congratulations on completing the challenge! Feel free to reply or ask any questions!