Hello!

For lines:

I think you lines look really good. For superimposed lines there isn't too much fraying. For ghosted lines the lines look confident. The ghosted planes also look okay. Though in some places there is arching of the line.

For ellipses:

You ellipses look good. There is some obvious discomfort in the ellipses however that is to be expected at the start. One thing however is that you should always draw over your ellipses. It does help. You have draw about 1 and a half times but it would be best to atleast draw twice completely over the ellipses.

For boxes:

Plotted perspective looks good. However in the rough perspective your lines look quite hesitant. If you can draw confident lines in the lines section you can draw confident lines for this too. Develop the habit of drawing confident lines over wobbly lines. Its okay if it is not "correct". The rotated boxes and the organic boxes look good. I think you are ready to take on the next challenge!