Congrats on finishing the challenge!

I think your convergences improved a lot over the course of the challenge, good job!

In the future I'd recommend drawing a wider variety of shapes and orientations to your boxes. Don't get stuck doing the same Y's over and over. This diagram has some ideas (not to be used to copy from): https://imgur.com/Kqg6uMX

Your hatching lines look pretty wobbly. It's okay if it frays on one end as long as the line is smooth and confident.

Your inner corner has improved a lot but to practice it further this ordering might help: https://imgur.com/FGdtVwm

I think you can try the advanced exercises if you want.