For the first 50, your lines are clean overall. However, I did see some arcing throughout the set. I also saw a few instances where lines appeared to be redrawn, like box 18 and box 31. Your convergences also show good accuracy, though I did see some lines pair off and converge towards two vanishing points, like in box 9's green lines, box 23's purple lines, and box 46's purple lines.

For the next 50, your lines show improvement, with less dramatic arcing overall. I also saw fewer instances of redrawn lines, like box 85. Your convergences also show improvement in accuracy, though there are a few more instances of lines pairing off, like box 54's red lines, box 74's purple lines, and box 91's red lines.

For the last 150, your lines continue to improve, with arcing further reduced. While some was still present at the end, your work shows good technique and consistency. I also saw very few instances of redrawn lines, though there were a few at the end like box 202 and box 240. Remember that, for this challenge, it's better to have one smooth, confident line than to try to fix it by redrawing.

Your convergences also continue to improve, though there are still instances of lines pairing off, like in box 108's purple lines, box 185's green lines, and box 221's green lines. 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 154 is missing some line extensions. It's not an issue since it only happened once, but I wanted to point it out for future reference.

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