For the first 50, your lines are very clean overall, though there is 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 box 9's purple lines, box 25's orange lines, and box 46's green lines.

For the next 50, your lines show improvement. Some arcing is still present thoughout the set, but most instances are less dramatic. Your convergences also show improvement, though I did see a few more instances of lines pairing off, like box 56's green lines, box 75's orange lines, and box 91's green lines.

For the last 150, your lines continue to improve, with fewer instances of arcing for the rest of the challenge. Since it is present throughout the challenge, I recommend reviewing the information in this section and ensure that you are practicing the proper technique. However, given your improvement, I think you're doing well.

Your convergences also continue to improve. There are still instances of lines pairing off, like box 114's purple lines, box 181's orange lines, and box 231's purple lines, though they are less frequent. However, this diagram may still 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, including: box 7, boxes 22 and 23, box 64, box 194, and box 217. Also, box 52, boxes 57 and 60, and box 62 have some lines extended in the wrong direction. Line extensions are a key part of this exercise, as they enable us to look out for any trends or habits to correct. Be sure to double-check that lines are extended correctly moving forward.

All said, I'm going to mark this challenge as complete.