Hello Furro! Your work is really well done, almost all of your lines in "ghosted lines" exercise are really smooth, confident and have high accuracy. The same also goes for your "superimposed lines" exercise too. (Although in your "ghosted lines" exercise, several lines tend to arc slightly.)

For your "ghosted planes" exercise, again, the accuracy, the strokes are pretty good, there are a few planes that are missing the cross line that bisects them.

I hope this would be useful to you!