Congrats to has finally finish this challenge, it's was pretty difficult no ?

1. You are extending lines in the right direction so one positive point, good job.

2. I notice that you were struggling with converging lines which are often converging too earlier however they are not being parallel or diverging which is a good point.

3. Your hatching lines are pretty and are on the right face which facing us, again good job.

4. When you are drawing a line which is a little bit off don't redo it, however your lines as a whole are pretty and straight.

5. You should do more of variety in the orientation of your box.

6. I saw that a lot of your Inner corner was off so a way to improve them is to start thinking about the relationships between lines instead of just thinking about the lines in pairs. When drawing the lines of the boxes, the student should keep in mind all the other lines in the set, comparing their angles and making a guess based on them. This diagram explain this more clearly:

https://i.imgur.com/8PqQLE0.png

The diagram can be pretty hard to understand at first, so if you don't understand it, don't get frustrated, keep reading it from time to time while practicing regularly, and it will click eventually.

It's can help you to change the order in which you drew boxes in. By drawing the inner corner before the last line of the box, it easier to use the previously mentioned info of thinking about the relationship between lines, and made it easier for me to get the convergences right. Here's the order I'm talking about:

https://imgur.com/a/DHlA3Jh

This takes into advantage something explained in the rotated boxes exercise too (taking advantage of lines that are very close), so give a look at the page if you want to know more about it.