For the first 50, your lines are clean overall, though there is arcing and wobbling 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 blue lines, box 27's green lines, and box 49's red lines.

For the next 50, your lines show improvement. Some arcing and wobbling is still present thoughout the set, but it's less dramatic than before. Your convergences also show improvement, though I did see a few more instances of lines pairing off, like box 59's blue lines, box 74's green lines, and box 97's blue lines.

For the last 150, your lines continue to improve, with arcing notably reduced. However, some wobbling is still present throughout the rest of the set. I recommend reviewing the information in this section and ensure that you are practicing the proper technique.

Your convergences also continue to improve, though there are still instances of lines pairing off, like box 109's green lines, box 178's green lines, and box 240's blue 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.

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