6:40 PM, Friday September 11th 2020
I agree with what Wister808 commented, but there are three additional things that I'd like to point out before I agree with their post and mark this as complete.
First off, every single straight line you make for draw a box should be ghosted-this includes the hatching lines. Ghosting requires a start and end point so that you have a distinct goal.
Second, a good number of your early boxes have line extensions going in the wrong direction. As you practice boxes in perspective and check them in the future, always start from the center point of your initial Y shape. Box 24 has all of the line extensions done correctly. Box 21's blue line extensions should be going left instead of going right. You do it this way because the perspective lines will only cross in one direction and it doesn't matter how far apart they go in the other direction.
Third, as I go through this I'm noticing that you included a lot of half finished or otherwise incomplete boxes in your final count. I think you need to do 10 more boxes so that you don't cheat yourself even if there is great improvement from start to finish. Maybe try some that are at a less extreme perspective?
Next Steps:
10 fully complete boxes (hatching optional) that keep in mind the things that Wister and I mentioned.