For the first 50, your lines are clean overall. However, I did see some arcing throughout the set. I also noticed some lines that overshot their end points. Your convergences also show good accuracy, though I did see some lines pair off and converge towards two vanishing points, like in box 8, box 26, and box 47.

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 overshooting the end points. Your convergences also show improvement in accuracy, though there are a few more instances of lines pairing off, like in box 55, box 72, and box 99.

For the last 150, your lines continue to improve, with wobbling further reduced towards the end. However, since it was present throughout the challenge, I do recommend reviewing the information in this section to ensure that you're practicing the proper technique.

Your convergences also continue to improve, though there are still instances of lines pairing off, like in box 105, box 173, and box 232. While they were less frequent towards the end, this diagram may be helpful to you. In these boxes, the inner lines (green and orange) 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: box 49, box 56, box 92, and box 163. It's not a major issue since it didn't happen often, but I want to point it out for future reference.

All said, you did very well. I'm going to mark this challenge as complete.