For the first 50, your lines are clean overall. However, I did see some arcing throughout the set. 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 48.

For the next 50, your lines show improvement. While some arcing is still present, most instances are less dramatic overall. Your convergences also show improvement in accuracy, though there are a few more instances of lines pairing off, like in box 51, box 75, and box 98.

For the last 150, your lines continue to improve, with fewer instances of arcing towards the end of the challenge. Since it was present throughout the challenge, I do recommend reviewing the information in this section. However, your improvement shows that your technique is coming along well.

Your convergences also continue to improve, though there are still instances of lines pairing off, like in box 106, box 174, and box 234. 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, box 34 is missing some line extensions. Also, box 126 has some lines extended in the wrong direction: . 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.