For the first 50, your lines are generally clean, but I did see some arcing and wobbling throughout the set. I also noticed instances where your lines overshot the end point in the first few pages. Your convergences also show good accuracy, though I did see some lines pair off and converge towards two vanishing points, like in box 7, box 25, and box 44.

For the next 50, your lines show improvement. While wobbling is still present, most instances are less dramatic overall. I also noticed fewer instances of lines overrunning end points. Your convergences also show improvement in accuracy, though there are a few more instances of lines pairing off, like box 56, box 74, and box 98.

For the last 150, your lines continue to improve, with wobbling notably reduced, especially by the end of the set. This shows a good improvement in technique and consistency. Since it was present throughout the challence, I recommend reviewing the information in this section to ensure that you are practicing the proper technique. However, your improvement shows that you're on the right track.

Your convergences also continue to improve, though there are still instances of lines pairing off, like in box 107, box 178, and box 227. In these boxes, the inner lines (green and orange in this diagram) diverge instead of converging at the vanishing point. Keeping in mind the angles of neighboring lines can help when planning the box's construction.

As an aside, some of your boxes are missing some line extensions: boxes 1, 3, and 5 and box 70. Also, some of your boxes have some lines extended in the wrong direction: box 17, boxes 61, 62, and 64, box 75, box 82, and box 87. It's not a major issue since it didn't happen often. Just be sure to double-check that your lines are extended properly moving forward.

While the rest of your challenge is in order, you appear to be missing the page containing boxes 246-250. I'm going to request a revision to submit the missing page.