It's kind of tricky to critique this since most of these aren't clearly numbered and they're kind of out of order (imgur does that sometimes, so numbering is super useful), but I'll at least point out a few things I noticed:

On this page a number of your extension lines are drawn in the wrong direction

You do have a tendency to go back over the same line a bunch of times - I'm not sure if this is for line weight, but it's more than likely at least a good chunk of the time to correct or hide mistakes. That's a bad habit to get into, it's better to leave your mistakes alone. Don't let them determine which lines will be darker and which will be lighter.

Drawing big is good, but I think you may be drawing a lot of these boxes so big that it becomes detrimental. Try fitting around 5 boxes to an A4 page.

I do think that your estimation of those convergences are getting better, and that you've demonstrated the ability to apply the ghosting method well (at least initially before you go back over things to correct mistakes), so that's definitely good. In the future, I'd definitely recommend laying things out in a somewhat more structured, organized fashion. It'll help you approach things in less erratic fashion (which may help you avoid going back over your lines so much), and will also make critiquing your work easier (right now it's making me a little scatterbrained).

Either way, congratulations on completing the challenge!