Hi there! I'll be reviewing your boxes today;

Overall these boxes look decent; you've been extending your lines in the correct directions, you've been attempting to find the appropriate vanishing points (instead of just drawing them parallel without much thought for convergence as some students do), and you're able to get selections of three (and occassionally 4) lines to converge mostly correct with a decent degree of accuracy in the later boxes.

Two things I'd like to point out however;

In the later boxes in the excercise I see a preference for dramatically foreshortened boxes (presumably because it's easier to visually see the vanishing points as they're close to the box's lines as you draw them). The frequency of these dramatically foreshortened boxes gradually picks up until the vast majority of boxes in your second part seem to be dramatically foreshortened.

I point it out as a word of caution, as focusing too heavily on these types of boxes may A. stunt your ability to draw lightly foreshortened boxes (which are extremely important.), and perhaps B. stunt your improvement overall, as since you can see where the VP is going to be, you develop a reliance on measuring and plotting out VP's instead of intuitively understanding where they should be.

It's probably not a huge issue, but I'd like to make mention if it regardless just so you don't end up neglecting shallow foreshortening.

The other point of note is that you seem to consistently have a single corner line veer off dramatically compared to the other three in the box. Of all the types of errors in your convergences (just getting them wrong primarily, nothing outwardly concerning), this is the most common one I see. This is often the result of accumulative mistakes in each line, causing the final line to be significantly inaccurate. This can be a difficult error to overcome as it requires you to understand the convergences as a whole set, instead of pieced together pair by pair (or in other fragmented ways).

This approach may help you here: https://imgur.com/a/DHlA3Jh

One last note on lineweight is that you should be applying it to all of the outer lines in the box as so: https://drawabox.com/lesson/250boxes/1/lineweight

Note this to be the exterior lines, not nessecarily the front facing lines. You're emphasising the silhouette here, not communicating the direction of the box, that's what the hatching is for.