I couldn't make out any particular order in which you uploaded them.

It seems you extended the lines correctly towards the vanishing points and you varied the length of the sides. Your lines are straight and confident.

Your skill has improved towards the end. The construction of the last ones is really good. The foreshortening is shallow.

Make sure when you add hatching that you keep it consistently spaced and it seems to me that when you added lineweight to the silhouette you went over the marks several times. Try to use the ghosting method when adding lineweight and make single confident marks.

I haven't counted your boxes but you have 42 pages with six or more boxes and one page with a single one which should suffice. Drawing more than six boxes per page makes it more difficult since you have to make the boxes themselves smaller.

Very well done. I mark the lesson as complete.