Overall there's a great deal of improvement over the set, and your boxes end up pretty good, nice job!

By the end of the challenge the only issue you end up having is trouble iwth the convergences of the inner corner. This is completely normal, and most people that finish the box challenge still have this issue, so don't worry about it.

Here are a few things so you can keep improving:

-When extending the lines, extend them all the way through, don't worry about the lines colliding with other boxes. The important part of extending the lines is finding your mistakes, and extending them as much as you can will help with that.

-Second thing is variety. For the next times you practice boxes, go for more long boxes, some really big boxes; in general try to change them and vary them as much as you can.

-When adding hatching, make sure your lines don't fray on two ends, place your pen carefully at the start of each line so this doesn't happen.

-And for the inner corner issue, a few things. The first one is that this issue is caused by the accumulation of all the previous mistakes you had on the boxes.

One thing that can help with this is to start thinking about the relationship between all the lines on a set, instead of just trying to think in pairs. This is explained on this diagram.

Drawing boxes on this order is something that helped me get the inner corner issue a bit better, as it made it easier for me to make guesses on the lines. Give it a try to see if it helps you.

Overall pretty good job! Keep it up and good luck with lesson 2!