Impressive effort and improvement! Occassionally I see that the back corner diverges, so I encourage you to try to visualize those planes when placing the corner down. https://i.imgur.com/8PqQLE0.png is the diagram used in official critiques if you'd like to take a look, https://drawabox.com/community/submission/3JVR7QEY and https://drawabox.com/community/submission/KCVNTJ0V. If you are willing, I'd love a look at my submission https://drawabox.com/community/submission/F1HGGAQR

I hope you've already moved on to lesson 2. I'm going to mark this complete.

Also like your hatching!