For the first 50, your lines are clean overall. However, I did see some 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 8's red lines, box 22, and box 45's red lines.

For the next 50, your lines show improvement. Wobbling is still present, but 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 box 62's green lines, box 77's blue lines, and box 97's red lines.

For the last 150, your lines continue to improve, with very little wobbling by the end of the set. Since it was present throughout the challenge, I do recommend reviewing the information in this section to ensure that you're practicing the proper technique.

Your convergences also continue to improve, though there are still instances of lines pairing off, like in box 129's green lines, box 171's green lines, and box 227's red 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, I saw some boxes that appeared to be hatched on the wrong side when looking at the line extensions, like box 77. Hatching should indicate the side nearest the viewer. One way to check that is to make sure it touches two arms of the initial Y.

Also, box 21 is missing some line extensions. More significantly, several of your boxes have some lines extended in the wrong direction, including this page, this page, this page, boxes 147 and 149, and box 230. As shown here, lines should be extended in the same direction as the branches of your original Y shape. I've also included a diagram based on one of your boxes, here.

Because of the frequency of these errors, I'm going to assign a revision for 15 more boxes in the style of the last 150.