Hello! Allow me to take a look at your boxes.

An important thing to note is that boxes drawn in 3 point perspective will always have their lines converge. Some of your first boxes have parallel extending lines. The good thing is that there's visible improvement in your later boxes. It looks like you understood that the extending lines need to face away from the viewer as well.

Your line work is really great! Remember to continue drawing your lines with confidence. One thing I would suggest is adding lineweight to the contour of your boxes to make them more 3 dimensional. It looks like your boxes have some variety in sizes and angles as well.

Overall you've done a wonderful job with this challenge. Keep it up!