hello Hiroeme,

welcome to draw a box,

Its always good to have figured out your weaknesses, I'll be looking further into it.

Lines:

Foremost, i would like to say that dont draw lines that arent related to the lesson, i'm talking about the little curve line in your first page.

You have shown good effort in superimposed lines, however i do sight a little wobbly lines here and there. make sure to draw from your shoulder and ghost them for every lines make. Patience is the key.

You have drawn Confident ghosted lines, keep it up, same with the planes too.

Ellipses:

As you've said, your ellipses do tend to go over the boundary, but its a very normal thing. For a beginner, you have done it fine. Again, its all a matter of ghosting and drawing through your shoulder, you'll be able to do it more accurate with time. You have followed through the instruction right, going through the ellipses 2 or 3 times, and you are focused on fitting the ellipses in given boundaries, So i dont see much problem here. There are some stiffed lines in ellipses, but again that a smooth line can be built as a habit with time.

Boxes:

I have nothing to say about the plotted perspective, its neat and i hope you found a tiny dive into a 3D space. Again, pretty good lines in boxes as well. You have mentioned about lines curving towards the end, thats possibly because you mistakenly drew it from wrist or arms. Besides, it also takes time to be able to control your shoulder freely. So you dont have to stress about it too much.I'm amazed with your rotated boxes, its so neat and the boxes are well rotated. Thats a quality work there. Finally about the organic perspective, I think you should be drawing that guide line with the principles of markmaking too, because they look wobbly. Overall they are well drawn.

Lastly, as you have read through it, you know i've been mentioning about making drawing through shoulder and ghosting a habit. So its best to do a little warmup with these exercises included for 5-10 minutes before you start a lesson everytime.