Hello, and thank you for your feedback!

My boxes in rough perspective might look crooked like that due to exhaustion and me not ghosting my lines properly. I tried my best to not do any guessing this time, although I kept changing the dots in the planning phase of ghosting lines to make sure it falls on the vanishing point. Should I keep doing that?

As for the rotated boxes exercise, I had quite a hard time adding in the missing boxes because some of the ones closer to the edges looks like they've been through a hydraulic press before I got the hang of drawing them.

In any case, I greatly appreciate your critique and will keep everything in mind for future warmups.

Here's the link:

https://imgur.com/a/ggaG6ce