Hey, sorry you had to wait a while to get your work critiqued.

1. Your extended lines are good but I did notice some are coming towards the viewer, rather then away. To combat this make sure the lines are drawn away from the center dot in the initial 'Y' part if the box.

2. The majority of tour lines are converging with a few divergences (this will go with time).

3. I noticed in some boxes, such as: 3, 14, 140,152 you've shaded parts that would be on the inside of the box rather then the face closest to the viewer (this may be because there's alot of lines and it can get confusing xD). Your hatching is good over all, the majority are on the right faces and aren't going over the lines too much.

4. I dont notice many wobbly lines in your work however, most of the extended lines have gone over the box lines which makes it hard to see them.

5. The orientation of your boxes are different (which is good) you've done this by creating different length of the fist initial three lines/the Y, some are shorted and some are longe then others creating different lengths, widths and depths. Another way you've done this is by rotating the initial Y, some are faced up, some are upside down etc. I think to improve you could add different angles between them, most seem to be around 120° try making some a smaller or larger angles like 180° or even 90° (this is something to just keep in mind).

Overall I think you've done a great job, keep it up! Just keep practicing when ever possible to keep improving your boxes :)