Hi, I will try to review your work a little and also I am no proffesional.

With the superimposed lines, I think focus more on the long whole arm movement and less on the lenght of the line, I mean it doesnt really matter if you end up more far away, but that your lines are more straight and less wobbly. But this will get better with practise.

About the ghosted lines and ghosted planes, some of them look quite good, some of them needs more work, thats normal, but I would recommend to do those lines more loosely and that can be aplied to the ghosting as well. With the planes I think you should try more angles, you are limiting yourself a bit there with almost just horizontal and vertical planes, now it doesnt really matter what you will end up if its still a plane so experiment, it will help.

Also try this one trick, put your pen on the start of the line and look at its end with your eyes, try to do the rest with your arm, I think try it first a bit faster and then try slower without losing the precision. This can help you with precision and line straightness as well.