For the first 50, your lines are clean overall, with only a little 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 in box 5, box 26, and box 48.

For the next 50, your lines remain clean. As before, I noticed very little wobbling throughout the set. Your convergences also show improvement in accuracy, though there are a few more instances of lines pairing off, like in box 60, box 79, and box 94.

For the last 150, your lines remain clean and even throughout the rest of the set, with minimal wobbling. This demonstrates good technique and consistency. Your convergences also continue to improve, though there are still instances of lines pairing off, like in box 111, box 173, and box 243. 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 24 and box 51 have some lines extended in the wrong direction. It's not an 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.