1:49 PM, Sunday May 3rd 2020
First of all, congratulations on doing the box challenge.
There are some major issues however.
You're drawing very small, probably drawing all of your lines with the wrist, without ghosting, and you haven't checked any convergence lines, as it's explained here.
When drawing lines, as I explained before on your lesson 1 critique, you need to draw them with the shoulder, with confident ghosted lines.
Next Steps:
You haven't followed the instructions of this lesson, so I'm going to ask you to do 50 more boxes. A maximum of 4 boxes per page, and filling the entire page with them, be sure you draw them big.
I recommend reading the instructions of the lesson again before starting. Be sure you apply the extension method explained in the lesson to every box you draw. Good luck and keep it up, you're almost there!